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5668 lines
188 KiB
JavaScript
5668 lines
188 KiB
JavaScript
/**
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* @license
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* Lo-Dash 1.3.0 (Custom Build) <http://lodash.com/>
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* Build: `lodash minus="template" -d`
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* Copyright 2012-2013 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.4.4 <http://underscorejs.org/>
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* Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud Inc.
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* Available under MIT license <http://lodash.com/license>
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*/
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;(function(window) {
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/** Used as a safe reference for `undefined` in pre ES5 environments */
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var undefined;
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/** Used to pool arrays and objects used internally */
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var arrayPool = [],
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objectPool = [];
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/** Used to generate unique IDs */
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var idCounter = 0;
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/** Used internally to indicate various things */
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var indicatorObject = {};
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/** Used to prefix keys to avoid issues with `__proto__` and properties on `Object.prototype` */
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var keyPrefix = +new Date + '';
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/** Used as the size when optimizations are enabled for large arrays */
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var largeArraySize = 75;
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/** Used as the max size of the `arrayPool` and `objectPool` */
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var maxPoolSize = 10;
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/** Used to match empty string literals in compiled template source */
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var reEmptyStringLeading = /\b__p \+= '';/g,
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reEmptyStringMiddle = /\b(__p \+=) '' \+/g,
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reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g;
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/** Used to match HTML entities */
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var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g;
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/**
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* Used to match ES6 template delimiters
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* http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6
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*/
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var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
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/** Used to match regexp flags from their coerced string values */
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var reFlags = /\w*$/;
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/** Used to match "interpolate" template delimiters */
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var reInterpolate = /<%=([\s\S]+?)%>/g;
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/** Used to detect functions containing a `this` reference */
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var reThis = (reThis = /\bthis\b/) && reThis.test(runInContext) && reThis;
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/** Used to detect and test whitespace */
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var whitespace = (
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// whitespace
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' \t\x0B\f\xA0\ufeff' +
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// line terminators
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'\n\r\u2028\u2029' +
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// unicode category "Zs" space separators
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'\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000'
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);
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/** Used to match leading whitespace and zeros to be removed */
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var reLeadingSpacesAndZeros = RegExp('^[' + whitespace + ']*0+(?=.$)');
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/** Used to ensure capturing order of template delimiters */
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var reNoMatch = /($^)/;
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/** Used to match HTML characters */
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var reUnescapedHtml = /[&<>"']/g;
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/** Used to match unescaped characters in compiled string literals */
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var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g;
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/** Used to assign default `context` object properties */
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var contextProps = [
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'Array', 'Boolean', 'Date', 'Error', 'Function', 'Math', 'Number', 'Object',
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'RegExp', 'String', '_', 'attachEvent', 'clearTimeout', 'isFinite', 'isNaN',
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'parseInt', 'setImmediate', 'setTimeout'
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];
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/** Used to fix the JScript [[DontEnum]] bug */
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var shadowedProps = [
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'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable',
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'toLocaleString', 'toString', 'valueOf'
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];
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/** Used to make template sourceURLs easier to identify */
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var templateCounter = 0;
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/** `Object#toString` result shortcuts */
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var argsClass = '[object Arguments]',
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arrayClass = '[object Array]',
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boolClass = '[object Boolean]',
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dateClass = '[object Date]',
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errorClass = '[object Error]',
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funcClass = '[object Function]',
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numberClass = '[object Number]',
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objectClass = '[object Object]',
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regexpClass = '[object RegExp]',
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stringClass = '[object String]';
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/** Used to identify object classifications that `_.clone` supports */
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var cloneableClasses = {};
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cloneableClasses[funcClass] = false;
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cloneableClasses[argsClass] = cloneableClasses[arrayClass] =
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cloneableClasses[boolClass] = cloneableClasses[dateClass] =
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cloneableClasses[numberClass] = cloneableClasses[objectClass] =
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cloneableClasses[regexpClass] = cloneableClasses[stringClass] = true;
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/** Used to determine if values are of the language type Object */
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var objectTypes = {
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'boolean': false,
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'function': true,
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'object': true,
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'number': false,
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'string': false,
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'undefined': false
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};
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/** Used to escape characters for inclusion in compiled string literals */
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var stringEscapes = {
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'\\': '\\',
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"'": "'",
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'\n': 'n',
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'\r': 'r',
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'\t': 't',
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'\u2028': 'u2028',
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'\u2029': 'u2029'
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};
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/** Detect free variable `exports` */
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var freeExports = objectTypes[typeof exports] && exports;
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/** Detect free variable `module` */
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var freeModule = objectTypes[typeof module] && module && module.exports == freeExports && module;
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/** Detect free variable `global`, from Node.js or Browserified code, and use it as `window` */
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var freeGlobal = objectTypes[typeof global] && global;
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if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal)) {
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window = freeGlobal;
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}
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/*--------------------------------------------------------------------------*/
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/**
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* A basic implementation of `_.indexOf` without support for binary searches
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* or `fromIndex` constraints.
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*
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* @private
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* @param {Array} array The array to search.
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* @param {Mixed} value The value to search for.
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* @param {Number} [fromIndex=0] The index to search from.
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* @returns {Number} Returns the index of the matched value or `-1`.
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*/
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function basicIndexOf(array, value, fromIndex) {
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var index = (fromIndex || 0) - 1,
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length = array.length;
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while (++index < length) {
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if (array[index] === value) {
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return index;
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}
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}
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return -1;
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}
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/**
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* An implementation of `_.contains` for cache objects that mimics the return
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* signature of `_.indexOf` by returning `0` if the value is found, else `-1`.
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*
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* @private
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* @param {Object} cache The cache object to inspect.
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* @param {Mixed} value The value to search for.
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* @returns {Number} Returns `0` if `value` is found, else `-1`.
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*/
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function cacheIndexOf(cache, value) {
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var type = typeof value;
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cache = cache.cache;
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if (type == 'boolean' || value == null) {
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return cache[value];
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}
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if (type != 'number' && type != 'string') {
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type = 'object';
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}
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var key = type == 'number' ? value : keyPrefix + value;
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cache = cache[type] || (cache[type] = {});
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return type == 'object'
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? (cache[key] && basicIndexOf(cache[key], value) > -1 ? 0 : -1)
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: (cache[key] ? 0 : -1);
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}
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/**
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* Adds a given `value` to the corresponding cache object.
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*
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* @private
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* @param {Mixed} value The value to add to the cache.
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*/
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function cachePush(value) {
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var cache = this.cache,
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type = typeof value;
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if (type == 'boolean' || value == null) {
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cache[value] = true;
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} else {
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if (type != 'number' && type != 'string') {
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type = 'object';
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}
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var key = type == 'number' ? value : keyPrefix + value,
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typeCache = cache[type] || (cache[type] = {});
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if (type == 'object') {
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if ((typeCache[key] || (typeCache[key] = [])).push(value) == this.array.length) {
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cache[type] = false;
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}
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} else {
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typeCache[key] = true;
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}
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}
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}
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/**
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* Used by `_.max` and `_.min` as the default `callback` when a given
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* `collection` is a string value.
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*
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* @private
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* @param {String} value The character to inspect.
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* @returns {Number} Returns the code unit of given character.
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*/
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function charAtCallback(value) {
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return value.charCodeAt(0);
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}
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/**
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* Used by `sortBy` to compare transformed `collection` values, stable sorting
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* them in ascending order.
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*
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* @private
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* @param {Object} a The object to compare to `b`.
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* @param {Object} b The object to compare to `a`.
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* @returns {Number} Returns the sort order indicator of `1` or `-1`.
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*/
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function compareAscending(a, b) {
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var ai = a.index,
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bi = b.index;
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a = a.criteria;
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b = b.criteria;
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// ensure a stable sort in V8 and other engines
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// http://code.google.com/p/v8/issues/detail?id=90
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if (a !== b) {
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if (a > b || typeof a == 'undefined') {
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return 1;
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}
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if (a < b || typeof b == 'undefined') {
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return -1;
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}
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}
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return ai < bi ? -1 : 1;
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}
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/**
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* Creates a cache object to optimize linear searches of large arrays.
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*
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* @private
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* @param {Array} [array=[]] The array to search.
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* @returns {Null|Object} Returns the cache object or `null` if caching should not be used.
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*/
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function createCache(array) {
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var index = -1,
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length = array.length;
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var cache = getObject();
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cache['false'] = cache['null'] = cache['true'] = cache['undefined'] = false;
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var result = getObject();
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result.array = array;
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result.cache = cache;
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result.push = cachePush;
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while (++index < length) {
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result.push(array[index]);
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}
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return cache.object === false
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? (releaseObject(result), null)
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: result;
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}
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/**
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* Used by `template` to escape characters for inclusion in compiled
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* string literals.
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*
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* @private
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* @param {String} match The matched character to escape.
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* @returns {String} Returns the escaped character.
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*/
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function escapeStringChar(match) {
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return '\\' + stringEscapes[match];
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}
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/**
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* Gets an array from the array pool or creates a new one if the pool is empty.
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*
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* @private
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* @returns {Array} The array from the pool.
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*/
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function getArray() {
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return arrayPool.pop() || [];
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}
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/**
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* Gets an object from the object pool or creates a new one if the pool is empty.
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*
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* @private
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* @returns {Object} The object from the pool.
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*/
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function getObject() {
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return objectPool.pop() || {
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'args': '',
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'array': null,
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'bottom': '',
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'criteria': null,
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'false': false,
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'firstArg': '',
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'index': 0,
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'init': '',
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'leading': false,
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'loop': '',
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'maxWait': 0,
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'null': false,
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'number': null,
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'object': null,
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'push': null,
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'shadowedProps': null,
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'string': null,
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'top': '',
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'trailing': false,
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'true': false,
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'undefined': false,
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'useHas': false,
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'useKeys': false,
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'value': null
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};
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}
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/**
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* Checks if `value` is a DOM node in IE < 9.
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*
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* @private
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* @param {Mixed} value The value to check.
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* @returns {Boolean} Returns `true` if the `value` is a DOM node, else `false`.
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*/
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function isNode(value) {
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// IE < 9 presents DOM nodes as `Object` objects except they have `toString`
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// methods that are `typeof` "string" and still can coerce nodes to strings
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return typeof value.toString != 'function' && typeof (value + '') == 'string';
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}
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/**
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* A no-operation function.
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*
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* @private
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*/
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function noop() {
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// no operation performed
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}
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/**
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* Releases the given `array` back to the array pool.
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*
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* @private
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* @param {Array} [array] The array to release.
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*/
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function releaseArray(array) {
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if (arrayPool.length == maxPoolSize) {
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arrayPool.length = maxPoolSize - 1;
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}
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array.length = 0;
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arrayPool.push(array);
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}
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/**
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* Releases the given `object` back to the object pool.
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*
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* @private
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* @param {Object} [object] The object to release.
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*/
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function releaseObject(object) {
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var cache = object.cache;
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if (cache) {
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releaseObject(cache);
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}
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if (objectPool.length == maxPoolSize) {
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objectPool.length = maxPoolSize - 1;
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}
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object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null;
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objectPool.push(object);
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}
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/**
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* Slices the `collection` from the `start` index up to, but not including,
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* the `end` index.
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*
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* Note: This function is used, instead of `Array#slice`, to support node lists
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* in IE < 9 and to ensure dense arrays are returned.
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*
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* @private
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* @param {Array|Object|String} collection The collection to slice.
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* @param {Number} start The start index.
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* @param {Number} end The end index.
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* @returns {Array} Returns the new array.
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*/
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function slice(array, start, end) {
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start || (start = 0);
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if (typeof end == 'undefined') {
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end = array ? array.length : 0;
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}
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var index = -1,
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length = end - start || 0,
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result = Array(length < 0 ? 0 : length);
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while (++index < length) {
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result[index] = array[start + index];
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}
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return result;
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}
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/*--------------------------------------------------------------------------*/
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/**
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* Create a new `lodash` function using the given `context` object.
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*
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* @static
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* @memberOf _
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* @category Utilities
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* @param {Object} [context=window] The context object.
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* @returns {Function} Returns the `lodash` function.
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*/
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function runInContext(context) {
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// Avoid issues with some ES3 environments that attempt to use values, named
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// after built-in constructors like `Object`, for the creation of literals.
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// ES5 clears this up by stating that literals must use built-in constructors.
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// See http://es5.github.com/#x11.1.5.
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context = context ? _.defaults(window.Object(), context, _.pick(window, contextProps)) : window;
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/** Native constructor references */
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var Array = context.Array,
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Boolean = context.Boolean,
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Date = context.Date,
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Error = context.Error,
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Function = context.Function,
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Math = context.Math,
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Number = context.Number,
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Object = context.Object,
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RegExp = context.RegExp,
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String = context.String,
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TypeError = context.TypeError;
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/**
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* Used for `Array` method references.
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*
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* Normally `Array.prototype` would suffice, however, using an array literal
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* avoids issues in Narwhal.
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*/
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var arrayRef = [];
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/** Used for native method references */
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var errorProto = Error.prototype,
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objectProto = Object.prototype,
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stringProto = String.prototype;
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/** Used to restore the original `_` reference in `noConflict` */
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var oldDash = context._;
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|
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/** Used to detect if a method is native */
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var reNative = RegExp('^' +
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String(objectProto.valueOf)
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.replace(/[.*+?^${}()|[\]\\]/g, '\\$&')
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.replace(/valueOf|for [^\]]+/g, '.+?') + '$'
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);
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/** Native method shortcuts */
|
|
var ceil = Math.ceil,
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clearTimeout = context.clearTimeout,
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|
concat = arrayRef.concat,
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floor = Math.floor,
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fnToString = Function.prototype.toString,
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getPrototypeOf = reNative.test(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf,
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hasOwnProperty = objectProto.hasOwnProperty,
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push = arrayRef.push,
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propertyIsEnumerable = objectProto.propertyIsEnumerable,
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setImmediate = context.setImmediate,
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setTimeout = context.setTimeout,
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toString = objectProto.toString;
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/* Native method shortcuts for methods with the same name as other `lodash` methods */
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var nativeBind = reNative.test(nativeBind = toString.bind) && nativeBind,
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nativeCreate = reNative.test(nativeCreate = Object.create) && nativeCreate,
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nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray,
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nativeIsFinite = context.isFinite,
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nativeIsNaN = context.isNaN,
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nativeKeys = reNative.test(nativeKeys = Object.keys) && nativeKeys,
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nativeMax = Math.max,
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nativeMin = Math.min,
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nativeParseInt = context.parseInt,
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nativeRandom = Math.random,
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nativeSlice = arrayRef.slice;
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/** Detect various environments */
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var isIeOpera = reNative.test(context.attachEvent),
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isV8 = nativeBind && !/\n|true/.test(nativeBind + isIeOpera);
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|
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/** Used to lookup a built-in constructor by [[Class]] */
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|
var ctorByClass = {};
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ctorByClass[arrayClass] = Array;
|
|
ctorByClass[boolClass] = Boolean;
|
|
ctorByClass[dateClass] = Date;
|
|
ctorByClass[funcClass] = Function;
|
|
ctorByClass[objectClass] = Object;
|
|
ctorByClass[numberClass] = Number;
|
|
ctorByClass[regexpClass] = RegExp;
|
|
ctorByClass[stringClass] = String;
|
|
|
|
/** Used to avoid iterating non-enumerable properties in IE < 9 */
|
|
var nonEnumProps = {};
|
|
nonEnumProps[arrayClass] = nonEnumProps[dateClass] = nonEnumProps[numberClass] = { 'constructor': true, 'toLocaleString': true, 'toString': true, 'valueOf': true };
|
|
nonEnumProps[boolClass] = nonEnumProps[stringClass] = { 'constructor': true, 'toString': true, 'valueOf': true };
|
|
nonEnumProps[errorClass] = nonEnumProps[funcClass] = nonEnumProps[regexpClass] = { 'constructor': true, 'toString': true };
|
|
nonEnumProps[objectClass] = { 'constructor': true };
|
|
|
|
(function() {
|
|
var length = shadowedProps.length;
|
|
while (length--) {
|
|
var prop = shadowedProps[length];
|
|
for (var className in nonEnumProps) {
|
|
if (hasOwnProperty.call(nonEnumProps, className) && !hasOwnProperty.call(nonEnumProps[className], prop)) {
|
|
nonEnumProps[className][prop] = false;
|
|
}
|
|
}
|
|
}
|
|
}());
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Creates a `lodash` object, which wraps the given `value`, to enable method
|
|
* chaining.
|
|
*
|
|
* In addition to Lo-Dash methods, wrappers also have the following `Array` methods:
|
|
* `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`,
|
|
* and `unshift`
|
|
*
|
|
* Chaining is supported in custom builds as long as the `value` method is
|
|
* implicitly or explicitly included in the build.
|
|
*
|
|
* The chainable wrapper functions are:
|
|
* `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`,
|
|
* `compose`, `concat`, `countBy`, `createCallback`, `debounce`, `defaults`,
|
|
* `defer`, `delay`, `difference`, `filter`, `flatten`, `forEach`, `forIn`,
|
|
* `forOwn`, `functions`, `groupBy`, `initial`, `intersection`, `invert`,
|
|
* `invoke`, `keys`, `map`, `max`, `memoize`, `merge`, `min`, `object`, `omit`,
|
|
* `once`, `pairs`, `partial`, `partialRight`, `pick`, `pluck`, `push`, `range`,
|
|
* `reject`, `rest`, `reverse`, `shuffle`, `slice`, `sort`, `sortBy`, `splice`,
|
|
* `tap`, `throttle`, `times`, `toArray`, `transform`, `union`, `uniq`, `unshift`,
|
|
* `unzip`, `values`, `where`, `without`, `wrap`, and `zip`
|
|
*
|
|
* The non-chainable wrapper functions are:
|
|
* `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `has`,
|
|
* `identity`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`,
|
|
* `isElement`, `isEmpty`, `isEqual`, `isFinite`, `isFunction`, `isNaN`,
|
|
* `isNull`, `isNumber`, `isObject`, `isPlainObject`, `isRegExp`, `isString`,
|
|
* `isUndefined`, `join`, `lastIndexOf`, `mixin`, `noConflict`, `parseInt`,
|
|
* `pop`, `random`, `reduce`, `reduceRight`, `result`, `shift`, `size`, `some`,
|
|
* `sortedIndex`, `runInContext`, `template`, `unescape`, `uniqueId`, and `value`
|
|
*
|
|
* The wrapper functions `first` and `last` return wrapped values when `n` is
|
|
* passed, otherwise they return unwrapped values.
|
|
*
|
|
* @name _
|
|
* @constructor
|
|
* @alias chain
|
|
* @category Chaining
|
|
* @param {Mixed} value The value to wrap in a `lodash` instance.
|
|
* @returns {Object} Returns a `lodash` instance.
|
|
* @example
|
|
*
|
|
* var wrapped = _([1, 2, 3]);
|
|
*
|
|
* // returns an unwrapped value
|
|
* wrapped.reduce(function(sum, num) {
|
|
* return sum + num;
|
|
* });
|
|
* // => 6
|
|
*
|
|
* // returns a wrapped value
|
|
* var squares = wrapped.map(function(num) {
|
|
* return num * num;
|
|
* });
|
|
*
|
|
* _.isArray(squares);
|
|
* // => false
|
|
*
|
|
* _.isArray(squares.value());
|
|
* // => true
|
|
*/
|
|
function lodash(value) {
|
|
// don't wrap if already wrapped, even if wrapped by a different `lodash` constructor
|
|
return (value && typeof value == 'object' && !isArray(value) && hasOwnProperty.call(value, '__wrapped__'))
|
|
? value
|
|
: new lodashWrapper(value);
|
|
}
|
|
|
|
/**
|
|
* A fast path for creating `lodash` wrapper objects.
|
|
*
|
|
* @private
|
|
* @param {Mixed} value The value to wrap in a `lodash` instance.
|
|
* @returns {Object} Returns a `lodash` instance.
|
|
*/
|
|
function lodashWrapper(value) {
|
|
this.__wrapped__ = value;
|
|
}
|
|
// ensure `new lodashWrapper` is an instance of `lodash`
|
|
lodashWrapper.prototype = lodash.prototype;
|
|
|
|
/**
|
|
* An object used to flag environments features.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Object
|
|
*/
|
|
var support = lodash.support = {};
|
|
|
|
(function() {
|
|
var ctor = function() { this.x = 1; },
|
|
object = { '0': 1, 'length': 1 },
|
|
props = [];
|
|
|
|
ctor.prototype = { 'valueOf': 1, 'y': 1 };
|
|
for (var prop in new ctor) { props.push(prop); }
|
|
for (prop in arguments) { }
|
|
|
|
/**
|
|
* Detect if `arguments` objects are `Object` objects (all but Narwhal and Opera < 10.5).
|
|
*
|
|
* @memberOf _.support
|
|
* @type Boolean
|
|
*/
|
|
support.argsObject = arguments.constructor == Object && !(arguments instanceof Array);
|
|
|
|
/**
|
|
* Detect if an `arguments` object's [[Class]] is resolvable (all but Firefox < 4, IE < 9).
|
|
*
|
|
* @memberOf _.support
|
|
* @type Boolean
|
|
*/
|
|
support.argsClass = isArguments(arguments);
|
|
|
|
/**
|
|
* Detect if `name` or `message` properties of `Error.prototype` are
|
|
* enumerable by default. (IE < 9, Safari < 5.1)
|
|
*
|
|
* @memberOf _.support
|
|
* @type Boolean
|
|
*/
|
|
support.enumErrorProps = propertyIsEnumerable.call(errorProto, 'message') || propertyIsEnumerable.call(errorProto, 'name');
|
|
|
|
/**
|
|
* Detect if `prototype` properties are enumerable by default.
|
|
*
|
|
* Firefox < 3.6, Opera > 9.50 - Opera < 11.60, and Safari < 5.1
|
|
* (if the prototype or a property on the prototype has been set)
|
|
* incorrectly sets a function's `prototype` property [[Enumerable]]
|
|
* value to `true`.
|
|
*
|
|
* @memberOf _.support
|
|
* @type Boolean
|
|
*/
|
|
support.enumPrototypes = propertyIsEnumerable.call(ctor, 'prototype');
|
|
|
|
/**
|
|
* Detect if `Function#bind` exists and is inferred to be fast (all but V8).
|
|
*
|
|
* @memberOf _.support
|
|
* @type Boolean
|
|
*/
|
|
support.fastBind = nativeBind && !isV8;
|
|
|
|
/**
|
|
* Detect if own properties are iterated after inherited properties (all but IE < 9).
|
|
*
|
|
* @memberOf _.support
|
|
* @type Boolean
|
|
*/
|
|
support.ownLast = props[0] != 'x';
|
|
|
|
/**
|
|
* Detect if `arguments` object indexes are non-enumerable
|
|
* (Firefox < 4, IE < 9, PhantomJS, Safari < 5.1).
|
|
*
|
|
* @memberOf _.support
|
|
* @type Boolean
|
|
*/
|
|
support.nonEnumArgs = prop != 0;
|
|
|
|
/**
|
|
* Detect if properties shadowing those on `Object.prototype` are non-enumerable.
|
|
*
|
|
* In IE < 9 an objects own properties, shadowing non-enumerable ones, are
|
|
* made non-enumerable as well (a.k.a the JScript [[DontEnum]] bug).
|
|
*
|
|
* @memberOf _.support
|
|
* @type Boolean
|
|
*/
|
|
support.nonEnumShadows = !/valueOf/.test(props);
|
|
|
|
/**
|
|
* Detect if `Array#shift` and `Array#splice` augment array-like objects correctly.
|
|
*
|
|
* Firefox < 10, IE compatibility mode, and IE < 9 have buggy Array `shift()`
|
|
* and `splice()` functions that fail to remove the last element, `value[0]`,
|
|
* of array-like objects even though the `length` property is set to `0`.
|
|
* The `shift()` method is buggy in IE 8 compatibility mode, while `splice()`
|
|
* is buggy regardless of mode in IE < 9 and buggy in compatibility mode in IE 9.
|
|
*
|
|
* @memberOf _.support
|
|
* @type Boolean
|
|
*/
|
|
support.spliceObjects = (arrayRef.splice.call(object, 0, 1), !object[0]);
|
|
|
|
/**
|
|
* Detect lack of support for accessing string characters by index.
|
|
*
|
|
* IE < 8 can't access characters by index and IE 8 can only access
|
|
* characters by index on string literals.
|
|
*
|
|
* @memberOf _.support
|
|
* @type Boolean
|
|
*/
|
|
support.unindexedChars = ('x'[0] + Object('x')[0]) != 'xx';
|
|
|
|
/**
|
|
* Detect if a DOM node's [[Class]] is resolvable (all but IE < 9)
|
|
* and that the JS engine errors when attempting to coerce an object to
|
|
* a string without a `toString` function.
|
|
*
|
|
* @memberOf _.support
|
|
* @type Boolean
|
|
*/
|
|
try {
|
|
support.nodeClass = !(toString.call(document) == objectClass && !({ 'toString': 0 } + ''));
|
|
} catch(e) {
|
|
support.nodeClass = true;
|
|
}
|
|
}(1));
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* The template used to create iterator functions.
|
|
*
|
|
* @private
|
|
* @param {Object} data The data object used to populate the text.
|
|
* @returns {String} Returns the interpolated text.
|
|
*/
|
|
var iteratorTemplate = function(obj) {
|
|
|
|
var __p = 'var index, iterable = ' +
|
|
(obj.firstArg) +
|
|
', result = ' +
|
|
(obj.init) +
|
|
';\nif (!iterable) return result;\n' +
|
|
(obj.top) +
|
|
';';
|
|
if (obj.array) {
|
|
__p += '\nvar length = iterable.length; index = -1;\nif (' +
|
|
(obj.array) +
|
|
') { ';
|
|
if (support.unindexedChars) {
|
|
__p += '\n if (isString(iterable)) {\n iterable = iterable.split(\'\')\n } ';
|
|
}
|
|
__p += '\n while (++index < length) {\n ' +
|
|
(obj.loop) +
|
|
';\n }\n}\nelse { ';
|
|
} else if (support.nonEnumArgs) {
|
|
__p += '\n var length = iterable.length; index = -1;\n if (length && isArguments(iterable)) {\n while (++index < length) {\n index += \'\';\n ' +
|
|
(obj.loop) +
|
|
';\n }\n } else { ';
|
|
}
|
|
|
|
if (support.enumPrototypes) {
|
|
__p += '\n var skipProto = typeof iterable == \'function\';\n ';
|
|
}
|
|
|
|
if (support.enumErrorProps) {
|
|
__p += '\n var skipErrorProps = iterable === errorProto || iterable instanceof Error;\n ';
|
|
}
|
|
|
|
var conditions = []; if (support.enumPrototypes) { conditions.push('!(skipProto && index == "prototype")'); } if (support.enumErrorProps) { conditions.push('!(skipErrorProps && (index == "message" || index == "name"))'); }
|
|
|
|
if (obj.useHas && obj.useKeys) {
|
|
__p += '\n var ownIndex = -1,\n ownProps = objectTypes[typeof iterable] && keys(iterable),\n length = ownProps ? ownProps.length : 0;\n\n while (++ownIndex < length) {\n index = ownProps[ownIndex];\n';
|
|
if (conditions.length) {
|
|
__p += ' if (' +
|
|
(conditions.join(' && ')) +
|
|
') {\n ';
|
|
}
|
|
__p +=
|
|
(obj.loop) +
|
|
'; ';
|
|
if (conditions.length) {
|
|
__p += '\n }';
|
|
}
|
|
__p += '\n } ';
|
|
} else {
|
|
__p += '\n for (index in iterable) {\n';
|
|
if (obj.useHas) { conditions.push("hasOwnProperty.call(iterable, index)"); } if (conditions.length) {
|
|
__p += ' if (' +
|
|
(conditions.join(' && ')) +
|
|
') {\n ';
|
|
}
|
|
__p +=
|
|
(obj.loop) +
|
|
'; ';
|
|
if (conditions.length) {
|
|
__p += '\n }';
|
|
}
|
|
__p += '\n } ';
|
|
if (support.nonEnumShadows) {
|
|
__p += '\n\n if (iterable !== objectProto) {\n var ctor = iterable.constructor,\n isProto = iterable === (ctor && ctor.prototype),\n className = iterable === stringProto ? stringClass : iterable === errorProto ? errorClass : toString.call(iterable),\n nonEnum = nonEnumProps[className];\n ';
|
|
for (k = 0; k < 7; k++) {
|
|
__p += '\n index = \'' +
|
|
(obj.shadowedProps[k]) +
|
|
'\';\n if ((!(isProto && nonEnum[index]) && hasOwnProperty.call(iterable, index))';
|
|
if (!obj.useHas) {
|
|
__p += ' || (!nonEnum[index] && iterable[index] !== objectProto[index])';
|
|
}
|
|
__p += ') {\n ' +
|
|
(obj.loop) +
|
|
';\n } ';
|
|
}
|
|
__p += '\n } ';
|
|
}
|
|
|
|
}
|
|
|
|
if (obj.array || support.nonEnumArgs) {
|
|
__p += '\n}';
|
|
}
|
|
__p +=
|
|
(obj.bottom) +
|
|
';\nreturn result';
|
|
|
|
return __p
|
|
};
|
|
|
|
/** Reusable iterator options for `assign` and `defaults` */
|
|
var defaultsIteratorOptions = {
|
|
'args': 'object, source, guard',
|
|
'top':
|
|
'var args = arguments,\n' +
|
|
' argsIndex = 0,\n' +
|
|
" argsLength = typeof guard == 'number' ? 2 : args.length;\n" +
|
|
'while (++argsIndex < argsLength) {\n' +
|
|
' iterable = args[argsIndex];\n' +
|
|
' if (iterable && objectTypes[typeof iterable]) {',
|
|
'loop': "if (typeof result[index] == 'undefined') result[index] = iterable[index]",
|
|
'bottom': ' }\n}'
|
|
};
|
|
|
|
/** Reusable iterator options shared by `each`, `forIn`, and `forOwn` */
|
|
var eachIteratorOptions = {
|
|
'args': 'collection, callback, thisArg',
|
|
'top': "callback = callback && typeof thisArg == 'undefined' ? callback : lodash.createCallback(callback, thisArg)",
|
|
'array': "typeof length == 'number'",
|
|
'loop': 'if (callback(iterable[index], index, collection) === false) return result'
|
|
};
|
|
|
|
/** Reusable iterator options for `forIn` and `forOwn` */
|
|
var forOwnIteratorOptions = {
|
|
'top': 'if (!objectTypes[typeof iterable]) return result;\n' + eachIteratorOptions.top,
|
|
'array': false
|
|
};
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Creates a function that, when called, invokes `func` with the `this` binding
|
|
* of `thisArg` and prepends any `partialArgs` to the arguments passed to the
|
|
* bound function.
|
|
*
|
|
* @private
|
|
* @param {Function|String} func The function to bind or the method name.
|
|
* @param {Mixed} [thisArg] The `this` binding of `func`.
|
|
* @param {Array} partialArgs An array of arguments to be partially applied.
|
|
* @param {Object} [idicator] Used to indicate binding by key or partially
|
|
* applying arguments from the right.
|
|
* @returns {Function} Returns the new bound function.
|
|
*/
|
|
function createBound(func, thisArg, partialArgs, indicator) {
|
|
var isFunc = isFunction(func),
|
|
isPartial = !partialArgs,
|
|
key = thisArg;
|
|
|
|
// juggle arguments
|
|
if (isPartial) {
|
|
var rightIndicator = indicator;
|
|
partialArgs = thisArg;
|
|
}
|
|
else if (!isFunc) {
|
|
if (!indicator) {
|
|
throw new TypeError;
|
|
}
|
|
thisArg = func;
|
|
}
|
|
|
|
function bound() {
|
|
// `Function#bind` spec
|
|
// http://es5.github.com/#x15.3.4.5
|
|
var args = arguments,
|
|
thisBinding = isPartial ? this : thisArg;
|
|
|
|
if (!isFunc) {
|
|
func = thisArg[key];
|
|
}
|
|
if (partialArgs.length) {
|
|
args = args.length
|
|
? (args = nativeSlice.call(args), rightIndicator ? args.concat(partialArgs) : partialArgs.concat(args))
|
|
: partialArgs;
|
|
}
|
|
if (this instanceof bound) {
|
|
// ensure `new bound` is an instance of `func`
|
|
thisBinding = createObject(func.prototype);
|
|
|
|
// mimic the constructor's `return` behavior
|
|
// http://es5.github.com/#x13.2.2
|
|
var result = func.apply(thisBinding, args);
|
|
return isObject(result) ? result : thisBinding;
|
|
}
|
|
return func.apply(thisBinding, args);
|
|
}
|
|
return bound;
|
|
}
|
|
|
|
/**
|
|
* Creates compiled iteration functions.
|
|
*
|
|
* @private
|
|
* @param {Object} [options1, options2, ...] The compile options object(s).
|
|
* array - A string of code to determine if the iterable is an array or array-like.
|
|
* useHas - A boolean to specify using `hasOwnProperty` checks in the object loop.
|
|
* useKeys - A boolean to specify using `_.keys` for own property iteration.
|
|
* args - A string of comma separated arguments the iteration function will accept.
|
|
* top - A string of code to execute before the iteration branches.
|
|
* loop - A string of code to execute in the object loop.
|
|
* bottom - A string of code to execute after the iteration branches.
|
|
* @returns {Function} Returns the compiled function.
|
|
*/
|
|
function createIterator() {
|
|
var data = getObject();
|
|
|
|
// data properties
|
|
data.shadowedProps = shadowedProps;
|
|
// iterator options
|
|
data.array = data.bottom = data.loop = data.top = '';
|
|
data.init = 'iterable';
|
|
data.useHas = true;
|
|
data.useKeys = !!keys;
|
|
|
|
// merge options into a template data object
|
|
for (var object, index = 0; object = arguments[index]; index++) {
|
|
for (var key in object) {
|
|
data[key] = object[key];
|
|
}
|
|
}
|
|
var args = data.args;
|
|
data.firstArg = /^[^,]+/.exec(args)[0];
|
|
|
|
// create the function factory
|
|
var factory = Function(
|
|
'errorClass, errorProto, hasOwnProperty, isArguments, isArray, ' +
|
|
'isString, keys, lodash, objectProto, objectTypes, nonEnumProps, ' +
|
|
'stringClass, stringProto, toString',
|
|
'return function(' + args + ') {\n' + iteratorTemplate(data) + '\n}'
|
|
);
|
|
|
|
releaseObject(data);
|
|
|
|
// return the compiled function
|
|
return factory(
|
|
errorClass, errorProto, hasOwnProperty, isArguments, isArray,
|
|
isString, keys, lodash, objectProto, objectTypes, nonEnumProps,
|
|
stringClass, stringProto, toString
|
|
);
|
|
}
|
|
|
|
/**
|
|
* Creates a new object with the specified `prototype`.
|
|
*
|
|
* @private
|
|
* @param {Object} prototype The prototype object.
|
|
* @returns {Object} Returns the new object.
|
|
*/
|
|
function createObject(prototype) {
|
|
return isObject(prototype) ? nativeCreate(prototype) : {};
|
|
}
|
|
// fallback for browsers without `Object.create`
|
|
if (!nativeCreate) {
|
|
var createObject = function(prototype) {
|
|
if (isObject(prototype)) {
|
|
noop.prototype = prototype;
|
|
var result = new noop;
|
|
noop.prototype = null;
|
|
}
|
|
return result || {};
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Used by `escape` to convert characters to HTML entities.
|
|
*
|
|
* @private
|
|
* @param {String} match The matched character to escape.
|
|
* @returns {String} Returns the escaped character.
|
|
*/
|
|
function escapeHtmlChar(match) {
|
|
return htmlEscapes[match];
|
|
}
|
|
|
|
/**
|
|
* Gets the appropriate "indexOf" function. If the `_.indexOf` method is
|
|
* customized, this method returns the custom method, otherwise it returns
|
|
* the `basicIndexOf` function.
|
|
*
|
|
* @private
|
|
* @returns {Function} Returns the "indexOf" function.
|
|
*/
|
|
function getIndexOf(array, value, fromIndex) {
|
|
var result = (result = lodash.indexOf) === indexOf ? basicIndexOf : result;
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates a function that juggles arguments, allowing argument overloading
|
|
* for `_.flatten` and `_.uniq`, before passing them to the given `func`.
|
|
*
|
|
* @private
|
|
* @param {Function} func The function to wrap.
|
|
* @returns {Function} Returns the new function.
|
|
*/
|
|
function overloadWrapper(func) {
|
|
return function(array, flag, callback, thisArg) {
|
|
// juggle arguments
|
|
if (typeof flag != 'boolean' && flag != null) {
|
|
thisArg = callback;
|
|
callback = !(thisArg && thisArg[flag] === array) ? flag : undefined;
|
|
flag = false;
|
|
}
|
|
if (callback != null) {
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
}
|
|
return func(array, flag, callback, thisArg);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* A fallback implementation of `isPlainObject` which checks if a given `value`
|
|
* is an object created by the `Object` constructor, assuming objects created
|
|
* by the `Object` constructor have no inherited enumerable properties and that
|
|
* there are no `Object.prototype` extensions.
|
|
*
|
|
* @private
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`.
|
|
*/
|
|
function shimIsPlainObject(value) {
|
|
var ctor,
|
|
result;
|
|
|
|
// avoid non Object objects, `arguments` objects, and DOM elements
|
|
if (!(value && toString.call(value) == objectClass) ||
|
|
(ctor = value.constructor, isFunction(ctor) && !(ctor instanceof ctor)) ||
|
|
(!support.argsClass && isArguments(value)) ||
|
|
(!support.nodeClass && isNode(value))) {
|
|
return false;
|
|
}
|
|
// IE < 9 iterates inherited properties before own properties. If the first
|
|
// iterated property is an object's own property then there are no inherited
|
|
// enumerable properties.
|
|
if (support.ownLast) {
|
|
forIn(value, function(value, key, object) {
|
|
result = hasOwnProperty.call(object, key);
|
|
return false;
|
|
});
|
|
return result !== false;
|
|
}
|
|
// In most environments an object's own properties are iterated before
|
|
// its inherited properties. If the last iterated property is an object's
|
|
// own property then there are no inherited enumerable properties.
|
|
forIn(value, function(value, key) {
|
|
result = key;
|
|
});
|
|
return result === undefined || hasOwnProperty.call(value, result);
|
|
}
|
|
|
|
/**
|
|
* Used by `unescape` to convert HTML entities to characters.
|
|
*
|
|
* @private
|
|
* @param {String} match The matched character to unescape.
|
|
* @returns {String} Returns the unescaped character.
|
|
*/
|
|
function unescapeHtmlChar(match) {
|
|
return htmlUnescapes[match];
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Checks if `value` is an `arguments` object.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is an `arguments` object, else `false`.
|
|
* @example
|
|
*
|
|
* (function() { return _.isArguments(arguments); })(1, 2, 3);
|
|
* // => true
|
|
*
|
|
* _.isArguments([1, 2, 3]);
|
|
* // => false
|
|
*/
|
|
function isArguments(value) {
|
|
return toString.call(value) == argsClass;
|
|
}
|
|
// fallback for browsers that can't detect `arguments` objects by [[Class]]
|
|
if (!support.argsClass) {
|
|
isArguments = function(value) {
|
|
return value ? hasOwnProperty.call(value, 'callee') : false;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is an array.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is an array, else `false`.
|
|
* @example
|
|
*
|
|
* (function() { return _.isArray(arguments); })();
|
|
* // => false
|
|
*
|
|
* _.isArray([1, 2, 3]);
|
|
* // => true
|
|
*/
|
|
var isArray = nativeIsArray || function(value) {
|
|
return value ? (typeof value == 'object' && toString.call(value) == arrayClass) : false;
|
|
};
|
|
|
|
/**
|
|
* A fallback implementation of `Object.keys` which produces an array of the
|
|
* given object's own enumerable property names.
|
|
*
|
|
* @private
|
|
* @type Function
|
|
* @param {Object} object The object to inspect.
|
|
* @returns {Array} Returns a new array of property names.
|
|
*/
|
|
var shimKeys = createIterator({
|
|
'args': 'object',
|
|
'init': '[]',
|
|
'top': 'if (!(objectTypes[typeof object])) return result',
|
|
'loop': 'result.push(index)'
|
|
});
|
|
|
|
/**
|
|
* Creates an array composed of the own enumerable property names of `object`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The object to inspect.
|
|
* @returns {Array} Returns a new array of property names.
|
|
* @example
|
|
*
|
|
* _.keys({ 'one': 1, 'two': 2, 'three': 3 });
|
|
* // => ['one', 'two', 'three'] (order is not guaranteed)
|
|
*/
|
|
var keys = !nativeKeys ? shimKeys : function(object) {
|
|
if (!isObject(object)) {
|
|
return [];
|
|
}
|
|
if ((support.enumPrototypes && typeof object == 'function') ||
|
|
(support.nonEnumArgs && object.length && isArguments(object))) {
|
|
return shimKeys(object);
|
|
}
|
|
return nativeKeys(object);
|
|
};
|
|
|
|
/**
|
|
* A function compiled to iterate `arguments` objects, arrays, objects, and
|
|
* strings consistenly across environments, executing the `callback` for each
|
|
* element in the `collection`. The `callback` is bound to `thisArg` and invoked
|
|
* with three arguments; (value, index|key, collection). Callbacks may exit
|
|
* iteration early by explicitly returning `false`.
|
|
*
|
|
* @private
|
|
* @type Function
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function} [callback=identity] The function called per iteration.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array|Object|String} Returns `collection`.
|
|
*/
|
|
var basicEach = createIterator(eachIteratorOptions);
|
|
|
|
/**
|
|
* Used to convert characters to HTML entities:
|
|
*
|
|
* Though the `>` character is escaped for symmetry, characters like `>` and `/`
|
|
* don't require escaping in HTML and have no special meaning unless they're part
|
|
* of a tag or an unquoted attribute value.
|
|
* http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact")
|
|
*/
|
|
var htmlEscapes = {
|
|
'&': '&',
|
|
'<': '<',
|
|
'>': '>',
|
|
'"': '"',
|
|
"'": '''
|
|
};
|
|
|
|
/** Used to convert HTML entities to characters */
|
|
var htmlUnescapes = invert(htmlEscapes);
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Assigns own enumerable properties of source object(s) to the destination
|
|
* object. Subsequent sources will overwrite property assignments of previous
|
|
* sources. If a `callback` function is passed, it will be executed to produce
|
|
* the assigned values. The `callback` is bound to `thisArg` and invoked with
|
|
* two arguments; (objectValue, sourceValue).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Function
|
|
* @alias extend
|
|
* @category Objects
|
|
* @param {Object} object The destination object.
|
|
* @param {Object} [source1, source2, ...] The source objects.
|
|
* @param {Function} [callback] The function to customize assigning values.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns the destination object.
|
|
* @example
|
|
*
|
|
* _.assign({ 'name': 'moe' }, { 'age': 40 });
|
|
* // => { 'name': 'moe', 'age': 40 }
|
|
*
|
|
* var defaults = _.partialRight(_.assign, function(a, b) {
|
|
* return typeof a == 'undefined' ? b : a;
|
|
* });
|
|
*
|
|
* var food = { 'name': 'apple' };
|
|
* defaults(food, { 'name': 'banana', 'type': 'fruit' });
|
|
* // => { 'name': 'apple', 'type': 'fruit' }
|
|
*/
|
|
var assign = createIterator(defaultsIteratorOptions, {
|
|
'top':
|
|
defaultsIteratorOptions.top.replace(';',
|
|
';\n' +
|
|
"if (argsLength > 3 && typeof args[argsLength - 2] == 'function') {\n" +
|
|
' var callback = lodash.createCallback(args[--argsLength - 1], args[argsLength--], 2);\n' +
|
|
"} else if (argsLength > 2 && typeof args[argsLength - 1] == 'function') {\n" +
|
|
' callback = args[--argsLength];\n' +
|
|
'}'
|
|
),
|
|
'loop': 'result[index] = callback ? callback(result[index], iterable[index]) : iterable[index]'
|
|
});
|
|
|
|
/**
|
|
* Creates a clone of `value`. If `deep` is `true`, nested objects will also
|
|
* be cloned, otherwise they will be assigned by reference. If a `callback`
|
|
* function is passed, it will be executed to produce the cloned values. If
|
|
* `callback` returns `undefined`, cloning will be handled by the method instead.
|
|
* The `callback` is bound to `thisArg` and invoked with one argument; (value).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to clone.
|
|
* @param {Boolean} [deep=false] A flag to indicate a deep clone.
|
|
* @param {Function} [callback] The function to customize cloning values.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @param- {Array} [stackA=[]] Tracks traversed source objects.
|
|
* @param- {Array} [stackB=[]] Associates clones with source counterparts.
|
|
* @returns {Mixed} Returns the cloned `value`.
|
|
* @example
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* var shallow = _.clone(stooges);
|
|
* shallow[0] === stooges[0];
|
|
* // => true
|
|
*
|
|
* var deep = _.clone(stooges, true);
|
|
* deep[0] === stooges[0];
|
|
* // => false
|
|
*
|
|
* _.mixin({
|
|
* 'clone': _.partialRight(_.clone, function(value) {
|
|
* return _.isElement(value) ? value.cloneNode(false) : undefined;
|
|
* })
|
|
* });
|
|
*
|
|
* var clone = _.clone(document.body);
|
|
* clone.childNodes.length;
|
|
* // => 0
|
|
*/
|
|
function clone(value, deep, callback, thisArg, stackA, stackB) {
|
|
var result = value;
|
|
|
|
// allows working with "Collections" methods without using their `callback`
|
|
// argument, `index|key`, for this method's `callback`
|
|
if (typeof deep != 'boolean' && deep != null) {
|
|
thisArg = callback;
|
|
callback = deep;
|
|
deep = false;
|
|
}
|
|
if (typeof callback == 'function') {
|
|
callback = (typeof thisArg == 'undefined')
|
|
? callback
|
|
: lodash.createCallback(callback, thisArg, 1);
|
|
|
|
result = callback(result);
|
|
if (typeof result != 'undefined') {
|
|
return result;
|
|
}
|
|
result = value;
|
|
}
|
|
// inspect [[Class]]
|
|
var isObj = isObject(result);
|
|
if (isObj) {
|
|
var className = toString.call(result);
|
|
if (!cloneableClasses[className] || (!support.nodeClass && isNode(result))) {
|
|
return result;
|
|
}
|
|
var isArr = isArray(result);
|
|
}
|
|
// shallow clone
|
|
if (!isObj || !deep) {
|
|
return isObj
|
|
? (isArr ? slice(result) : assign({}, result))
|
|
: result;
|
|
}
|
|
var ctor = ctorByClass[className];
|
|
switch (className) {
|
|
case boolClass:
|
|
case dateClass:
|
|
return new ctor(+result);
|
|
|
|
case numberClass:
|
|
case stringClass:
|
|
return new ctor(result);
|
|
|
|
case regexpClass:
|
|
return ctor(result.source, reFlags.exec(result));
|
|
}
|
|
// check for circular references and return corresponding clone
|
|
var initedStack = !stackA;
|
|
stackA || (stackA = getArray());
|
|
stackB || (stackB = getArray());
|
|
|
|
var length = stackA.length;
|
|
while (length--) {
|
|
if (stackA[length] == value) {
|
|
return stackB[length];
|
|
}
|
|
}
|
|
// init cloned object
|
|
result = isArr ? ctor(result.length) : {};
|
|
|
|
// add array properties assigned by `RegExp#exec`
|
|
if (isArr) {
|
|
if (hasOwnProperty.call(value, 'index')) {
|
|
result.index = value.index;
|
|
}
|
|
if (hasOwnProperty.call(value, 'input')) {
|
|
result.input = value.input;
|
|
}
|
|
}
|
|
// add the source value to the stack of traversed objects
|
|
// and associate it with its clone
|
|
stackA.push(value);
|
|
stackB.push(result);
|
|
|
|
// recursively populate clone (susceptible to call stack limits)
|
|
(isArr ? basicEach : forOwn)(value, function(objValue, key) {
|
|
result[key] = clone(objValue, deep, callback, undefined, stackA, stackB);
|
|
});
|
|
|
|
if (initedStack) {
|
|
releaseArray(stackA);
|
|
releaseArray(stackB);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates a deep clone of `value`. If a `callback` function is passed,
|
|
* it will be executed to produce the cloned values. If `callback` returns
|
|
* `undefined`, cloning will be handled by the method instead. The `callback`
|
|
* is bound to `thisArg` and invoked with one argument; (value).
|
|
*
|
|
* Note: This method is loosely based on the structured clone algorithm. Functions
|
|
* and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and
|
|
* objects created by constructors other than `Object` are cloned to plain `Object` objects.
|
|
* See http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to deep clone.
|
|
* @param {Function} [callback] The function to customize cloning values.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the deep cloned `value`.
|
|
* @example
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* var deep = _.cloneDeep(stooges);
|
|
* deep[0] === stooges[0];
|
|
* // => false
|
|
*
|
|
* var view = {
|
|
* 'label': 'docs',
|
|
* 'node': element
|
|
* };
|
|
*
|
|
* var clone = _.cloneDeep(view, function(value) {
|
|
* return _.isElement(value) ? value.cloneNode(true) : undefined;
|
|
* });
|
|
*
|
|
* clone.node == view.node;
|
|
* // => false
|
|
*/
|
|
function cloneDeep(value, callback, thisArg) {
|
|
return clone(value, true, callback, thisArg);
|
|
}
|
|
|
|
/**
|
|
* Assigns own enumerable properties of source object(s) to the destination
|
|
* object for all destination properties that resolve to `undefined`. Once a
|
|
* property is set, additional defaults of the same property will be ignored.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Function
|
|
* @category Objects
|
|
* @param {Object} object The destination object.
|
|
* @param {Object} [source1, source2, ...] The source objects.
|
|
* @param- {Object} [guard] Allows working with `_.reduce` without using its
|
|
* callback's `key` and `object` arguments as sources.
|
|
* @returns {Object} Returns the destination object.
|
|
* @example
|
|
*
|
|
* var food = { 'name': 'apple' };
|
|
* _.defaults(food, { 'name': 'banana', 'type': 'fruit' });
|
|
* // => { 'name': 'apple', 'type': 'fruit' }
|
|
*/
|
|
var defaults = createIterator(defaultsIteratorOptions);
|
|
|
|
/**
|
|
* This method is similar to `_.find`, except that it returns the key of the
|
|
* element that passes the callback check, instead of the element itself.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The object to search.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the key of the found element, else `undefined`.
|
|
* @example
|
|
*
|
|
* _.findKey({ 'a': 1, 'b': 2, 'c': 3, 'd': 4 }, function(num) {
|
|
* return num % 2 == 0;
|
|
* });
|
|
* // => 'b'
|
|
*/
|
|
function findKey(object, callback, thisArg) {
|
|
var result;
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
forOwn(object, function(value, key, object) {
|
|
if (callback(value, key, object)) {
|
|
result = key;
|
|
return false;
|
|
}
|
|
});
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Iterates over `object`'s own and inherited enumerable properties, executing
|
|
* the `callback` for each property. The `callback` is bound to `thisArg` and
|
|
* invoked with three arguments; (value, key, object). Callbacks may exit iteration
|
|
* early by explicitly returning `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Function
|
|
* @category Objects
|
|
* @param {Object} object The object to iterate over.
|
|
* @param {Function} [callback=identity] The function called per iteration.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns `object`.
|
|
* @example
|
|
*
|
|
* function Dog(name) {
|
|
* this.name = name;
|
|
* }
|
|
*
|
|
* Dog.prototype.bark = function() {
|
|
* alert('Woof, woof!');
|
|
* };
|
|
*
|
|
* _.forIn(new Dog('Dagny'), function(value, key) {
|
|
* alert(key);
|
|
* });
|
|
* // => alerts 'name' and 'bark' (order is not guaranteed)
|
|
*/
|
|
var forIn = createIterator(eachIteratorOptions, forOwnIteratorOptions, {
|
|
'useHas': false
|
|
});
|
|
|
|
/**
|
|
* Iterates over an object's own enumerable properties, executing the `callback`
|
|
* for each property. The `callback` is bound to `thisArg` and invoked with three
|
|
* arguments; (value, key, object). Callbacks may exit iteration early by explicitly
|
|
* returning `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Function
|
|
* @category Objects
|
|
* @param {Object} object The object to iterate over.
|
|
* @param {Function} [callback=identity] The function called per iteration.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns `object`.
|
|
* @example
|
|
*
|
|
* _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) {
|
|
* alert(key);
|
|
* });
|
|
* // => alerts '0', '1', and 'length' (order is not guaranteed)
|
|
*/
|
|
var forOwn = createIterator(eachIteratorOptions, forOwnIteratorOptions);
|
|
|
|
/**
|
|
* Creates a sorted array of all enumerable properties, own and inherited,
|
|
* of `object` that have function values.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias methods
|
|
* @category Objects
|
|
* @param {Object} object The object to inspect.
|
|
* @returns {Array} Returns a new array of property names that have function values.
|
|
* @example
|
|
*
|
|
* _.functions(_);
|
|
* // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...]
|
|
*/
|
|
function functions(object) {
|
|
var result = [];
|
|
forIn(object, function(value, key) {
|
|
if (isFunction(value)) {
|
|
result.push(key);
|
|
}
|
|
});
|
|
return result.sort();
|
|
}
|
|
|
|
/**
|
|
* Checks if the specified object `property` exists and is a direct property,
|
|
* instead of an inherited property.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The object to check.
|
|
* @param {String} property The property to check for.
|
|
* @returns {Boolean} Returns `true` if key is a direct property, else `false`.
|
|
* @example
|
|
*
|
|
* _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b');
|
|
* // => true
|
|
*/
|
|
function has(object, property) {
|
|
return object ? hasOwnProperty.call(object, property) : false;
|
|
}
|
|
|
|
/**
|
|
* Creates an object composed of the inverted keys and values of the given `object`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The object to invert.
|
|
* @returns {Object} Returns the created inverted object.
|
|
* @example
|
|
*
|
|
* _.invert({ 'first': 'moe', 'second': 'larry' });
|
|
* // => { 'moe': 'first', 'larry': 'second' }
|
|
*/
|
|
function invert(object) {
|
|
var index = -1,
|
|
props = keys(object),
|
|
length = props.length,
|
|
result = {};
|
|
|
|
while (++index < length) {
|
|
var key = props[index];
|
|
result[object[key]] = key;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is a boolean value.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is a boolean value, else `false`.
|
|
* @example
|
|
*
|
|
* _.isBoolean(null);
|
|
* // => false
|
|
*/
|
|
function isBoolean(value) {
|
|
return value === true || value === false || toString.call(value) == boolClass;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is a date.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is a date, else `false`.
|
|
* @example
|
|
*
|
|
* _.isDate(new Date);
|
|
* // => true
|
|
*/
|
|
function isDate(value) {
|
|
return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is a DOM element.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is a DOM element, else `false`.
|
|
* @example
|
|
*
|
|
* _.isElement(document.body);
|
|
* // => true
|
|
*/
|
|
function isElement(value) {
|
|
return value ? value.nodeType === 1 : false;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is empty. Arrays, strings, or `arguments` objects with a
|
|
* length of `0` and objects with no own enumerable properties are considered
|
|
* "empty".
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Array|Object|String} value The value to inspect.
|
|
* @returns {Boolean} Returns `true`, if the `value` is empty, else `false`.
|
|
* @example
|
|
*
|
|
* _.isEmpty([1, 2, 3]);
|
|
* // => false
|
|
*
|
|
* _.isEmpty({});
|
|
* // => true
|
|
*
|
|
* _.isEmpty('');
|
|
* // => true
|
|
*/
|
|
function isEmpty(value) {
|
|
var result = true;
|
|
if (!value) {
|
|
return result;
|
|
}
|
|
var className = toString.call(value),
|
|
length = value.length;
|
|
|
|
if ((className == arrayClass || className == stringClass ||
|
|
(support.argsClass ? className == argsClass : isArguments(value))) ||
|
|
(className == objectClass && typeof length == 'number' && isFunction(value.splice))) {
|
|
return !length;
|
|
}
|
|
forOwn(value, function() {
|
|
return (result = false);
|
|
});
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Performs a deep comparison between two values to determine if they are
|
|
* equivalent to each other. If `callback` is passed, it will be executed to
|
|
* compare values. If `callback` returns `undefined`, comparisons will be handled
|
|
* by the method instead. The `callback` is bound to `thisArg` and invoked with
|
|
* two arguments; (a, b).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} a The value to compare.
|
|
* @param {Mixed} b The other value to compare.
|
|
* @param {Function} [callback] The function to customize comparing values.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @param- {Array} [stackA=[]] Tracks traversed `a` objects.
|
|
* @param- {Array} [stackB=[]] Tracks traversed `b` objects.
|
|
* @returns {Boolean} Returns `true`, if the values are equivalent, else `false`.
|
|
* @example
|
|
*
|
|
* var moe = { 'name': 'moe', 'age': 40 };
|
|
* var copy = { 'name': 'moe', 'age': 40 };
|
|
*
|
|
* moe == copy;
|
|
* // => false
|
|
*
|
|
* _.isEqual(moe, copy);
|
|
* // => true
|
|
*
|
|
* var words = ['hello', 'goodbye'];
|
|
* var otherWords = ['hi', 'goodbye'];
|
|
*
|
|
* _.isEqual(words, otherWords, function(a, b) {
|
|
* var reGreet = /^(?:hello|hi)$/i,
|
|
* aGreet = _.isString(a) && reGreet.test(a),
|
|
* bGreet = _.isString(b) && reGreet.test(b);
|
|
*
|
|
* return (aGreet || bGreet) ? (aGreet == bGreet) : undefined;
|
|
* });
|
|
* // => true
|
|
*/
|
|
function isEqual(a, b, callback, thisArg, stackA, stackB) {
|
|
// used to indicate that when comparing objects, `a` has at least the properties of `b`
|
|
var whereIndicator = callback === indicatorObject;
|
|
if (typeof callback == 'function' && !whereIndicator) {
|
|
callback = lodash.createCallback(callback, thisArg, 2);
|
|
var result = callback(a, b);
|
|
if (typeof result != 'undefined') {
|
|
return !!result;
|
|
}
|
|
}
|
|
// exit early for identical values
|
|
if (a === b) {
|
|
// treat `+0` vs. `-0` as not equal
|
|
return a !== 0 || (1 / a == 1 / b);
|
|
}
|
|
var type = typeof a,
|
|
otherType = typeof b;
|
|
|
|
// exit early for unlike primitive values
|
|
if (a === a &&
|
|
(!a || (type != 'function' && type != 'object')) &&
|
|
(!b || (otherType != 'function' && otherType != 'object'))) {
|
|
return false;
|
|
}
|
|
// exit early for `null` and `undefined`, avoiding ES3's Function#call behavior
|
|
// http://es5.github.com/#x15.3.4.4
|
|
if (a == null || b == null) {
|
|
return a === b;
|
|
}
|
|
// compare [[Class]] names
|
|
var className = toString.call(a),
|
|
otherClass = toString.call(b);
|
|
|
|
if (className == argsClass) {
|
|
className = objectClass;
|
|
}
|
|
if (otherClass == argsClass) {
|
|
otherClass = objectClass;
|
|
}
|
|
if (className != otherClass) {
|
|
return false;
|
|
}
|
|
switch (className) {
|
|
case boolClass:
|
|
case dateClass:
|
|
// coerce dates and booleans to numbers, dates to milliseconds and booleans
|
|
// to `1` or `0`, treating invalid dates coerced to `NaN` as not equal
|
|
return +a == +b;
|
|
|
|
case numberClass:
|
|
// treat `NaN` vs. `NaN` as equal
|
|
return (a != +a)
|
|
? b != +b
|
|
// but treat `+0` vs. `-0` as not equal
|
|
: (a == 0 ? (1 / a == 1 / b) : a == +b);
|
|
|
|
case regexpClass:
|
|
case stringClass:
|
|
// coerce regexes to strings (http://es5.github.com/#x15.10.6.4)
|
|
// treat string primitives and their corresponding object instances as equal
|
|
return a == String(b);
|
|
}
|
|
var isArr = className == arrayClass;
|
|
if (!isArr) {
|
|
// unwrap any `lodash` wrapped values
|
|
if (hasOwnProperty.call(a, '__wrapped__ ') || hasOwnProperty.call(b, '__wrapped__')) {
|
|
return isEqual(a.__wrapped__ || a, b.__wrapped__ || b, callback, thisArg, stackA, stackB);
|
|
}
|
|
// exit for functions and DOM nodes
|
|
if (className != objectClass || (!support.nodeClass && (isNode(a) || isNode(b)))) {
|
|
return false;
|
|
}
|
|
// in older versions of Opera, `arguments` objects have `Array` constructors
|
|
var ctorA = !support.argsObject && isArguments(a) ? Object : a.constructor,
|
|
ctorB = !support.argsObject && isArguments(b) ? Object : b.constructor;
|
|
|
|
// non `Object` object instances with different constructors are not equal
|
|
if (ctorA != ctorB && !(
|
|
isFunction(ctorA) && ctorA instanceof ctorA &&
|
|
isFunction(ctorB) && ctorB instanceof ctorB
|
|
)) {
|
|
return false;
|
|
}
|
|
}
|
|
// assume cyclic structures are equal
|
|
// the algorithm for detecting cyclic structures is adapted from ES 5.1
|
|
// section 15.12.3, abstract operation `JO` (http://es5.github.com/#x15.12.3)
|
|
var initedStack = !stackA;
|
|
stackA || (stackA = getArray());
|
|
stackB || (stackB = getArray());
|
|
|
|
var length = stackA.length;
|
|
while (length--) {
|
|
if (stackA[length] == a) {
|
|
return stackB[length] == b;
|
|
}
|
|
}
|
|
var size = 0;
|
|
result = true;
|
|
|
|
// add `a` and `b` to the stack of traversed objects
|
|
stackA.push(a);
|
|
stackB.push(b);
|
|
|
|
// recursively compare objects and arrays (susceptible to call stack limits)
|
|
if (isArr) {
|
|
length = a.length;
|
|
size = b.length;
|
|
|
|
// compare lengths to determine if a deep comparison is necessary
|
|
result = size == a.length;
|
|
if (!result && !whereIndicator) {
|
|
return result;
|
|
}
|
|
// deep compare the contents, ignoring non-numeric properties
|
|
while (size--) {
|
|
var index = length,
|
|
value = b[size];
|
|
|
|
if (whereIndicator) {
|
|
while (index--) {
|
|
if ((result = isEqual(a[index], value, callback, thisArg, stackA, stackB))) {
|
|
break;
|
|
}
|
|
}
|
|
} else if (!(result = isEqual(a[size], value, callback, thisArg, stackA, stackB))) {
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
// deep compare objects using `forIn`, instead of `forOwn`, to avoid `Object.keys`
|
|
// which, in this case, is more costly
|
|
forIn(b, function(value, key, b) {
|
|
if (hasOwnProperty.call(b, key)) {
|
|
// count the number of properties.
|
|
size++;
|
|
// deep compare each property value.
|
|
return (result = hasOwnProperty.call(a, key) && isEqual(a[key], value, callback, thisArg, stackA, stackB));
|
|
}
|
|
});
|
|
|
|
if (result && !whereIndicator) {
|
|
// ensure both objects have the same number of properties
|
|
forIn(a, function(value, key, a) {
|
|
if (hasOwnProperty.call(a, key)) {
|
|
// `size` will be `-1` if `a` has more properties than `b`
|
|
return (result = --size > -1);
|
|
}
|
|
});
|
|
}
|
|
if (initedStack) {
|
|
releaseArray(stackA);
|
|
releaseArray(stackB);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is, or can be coerced to, a finite number.
|
|
*
|
|
* Note: This is not the same as native `isFinite`, which will return true for
|
|
* booleans and empty strings. See http://es5.github.com/#x15.1.2.5.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is finite, else `false`.
|
|
* @example
|
|
*
|
|
* _.isFinite(-101);
|
|
* // => true
|
|
*
|
|
* _.isFinite('10');
|
|
* // => true
|
|
*
|
|
* _.isFinite(true);
|
|
* // => false
|
|
*
|
|
* _.isFinite('');
|
|
* // => false
|
|
*
|
|
* _.isFinite(Infinity);
|
|
* // => false
|
|
*/
|
|
function isFinite(value) {
|
|
return nativeIsFinite(value) && !nativeIsNaN(parseFloat(value));
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is a function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is a function, else `false`.
|
|
* @example
|
|
*
|
|
* _.isFunction(_);
|
|
* // => true
|
|
*/
|
|
function isFunction(value) {
|
|
return typeof value == 'function';
|
|
}
|
|
// fallback for older versions of Chrome and Safari
|
|
if (isFunction(/x/)) {
|
|
isFunction = function(value) {
|
|
return typeof value == 'function' && toString.call(value) == funcClass;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is the language type of Object.
|
|
* (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is an object, else `false`.
|
|
* @example
|
|
*
|
|
* _.isObject({});
|
|
* // => true
|
|
*
|
|
* _.isObject([1, 2, 3]);
|
|
* // => true
|
|
*
|
|
* _.isObject(1);
|
|
* // => false
|
|
*/
|
|
function isObject(value) {
|
|
// check if the value is the ECMAScript language type of Object
|
|
// http://es5.github.com/#x8
|
|
// and avoid a V8 bug
|
|
// http://code.google.com/p/v8/issues/detail?id=2291
|
|
return !!(value && objectTypes[typeof value]);
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is `NaN`.
|
|
*
|
|
* Note: This is not the same as native `isNaN`, which will return `true` for
|
|
* `undefined` and other values. See http://es5.github.com/#x15.1.2.4.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is `NaN`, else `false`.
|
|
* @example
|
|
*
|
|
* _.isNaN(NaN);
|
|
* // => true
|
|
*
|
|
* _.isNaN(new Number(NaN));
|
|
* // => true
|
|
*
|
|
* isNaN(undefined);
|
|
* // => true
|
|
*
|
|
* _.isNaN(undefined);
|
|
* // => false
|
|
*/
|
|
function isNaN(value) {
|
|
// `NaN` as a primitive is the only value that is not equal to itself
|
|
// (perform the [[Class]] check first to avoid errors with some host objects in IE)
|
|
return isNumber(value) && value != +value
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is `null`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is `null`, else `false`.
|
|
* @example
|
|
*
|
|
* _.isNull(null);
|
|
* // => true
|
|
*
|
|
* _.isNull(undefined);
|
|
* // => false
|
|
*/
|
|
function isNull(value) {
|
|
return value === null;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is a number.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is a number, else `false`.
|
|
* @example
|
|
*
|
|
* _.isNumber(8.4 * 5);
|
|
* // => true
|
|
*/
|
|
function isNumber(value) {
|
|
return typeof value == 'number' || toString.call(value) == numberClass;
|
|
}
|
|
|
|
/**
|
|
* Checks if a given `value` is an object created by the `Object` constructor.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`.
|
|
* @example
|
|
*
|
|
* function Stooge(name, age) {
|
|
* this.name = name;
|
|
* this.age = age;
|
|
* }
|
|
*
|
|
* _.isPlainObject(new Stooge('moe', 40));
|
|
* // => false
|
|
*
|
|
* _.isPlainObject([1, 2, 3]);
|
|
* // => false
|
|
*
|
|
* _.isPlainObject({ 'name': 'moe', 'age': 40 });
|
|
* // => true
|
|
*/
|
|
var isPlainObject = !getPrototypeOf ? shimIsPlainObject : function(value) {
|
|
if (!(value && toString.call(value) == objectClass) || (!support.argsClass && isArguments(value))) {
|
|
return false;
|
|
}
|
|
var valueOf = value.valueOf,
|
|
objProto = typeof valueOf == 'function' && (objProto = getPrototypeOf(valueOf)) && getPrototypeOf(objProto);
|
|
|
|
return objProto
|
|
? (value == objProto || getPrototypeOf(value) == objProto)
|
|
: shimIsPlainObject(value);
|
|
};
|
|
|
|
/**
|
|
* Checks if `value` is a regular expression.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is a regular expression, else `false`.
|
|
* @example
|
|
*
|
|
* _.isRegExp(/moe/);
|
|
* // => true
|
|
*/
|
|
function isRegExp(value) {
|
|
return !!(value && objectTypes[typeof value]) && toString.call(value) == regexpClass;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is a string.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is a string, else `false`.
|
|
* @example
|
|
*
|
|
* _.isString('moe');
|
|
* // => true
|
|
*/
|
|
function isString(value) {
|
|
return typeof value == 'string' || toString.call(value) == stringClass;
|
|
}
|
|
|
|
/**
|
|
* Checks if `value` is `undefined`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Mixed} value The value to check.
|
|
* @returns {Boolean} Returns `true`, if the `value` is `undefined`, else `false`.
|
|
* @example
|
|
*
|
|
* _.isUndefined(void 0);
|
|
* // => true
|
|
*/
|
|
function isUndefined(value) {
|
|
return typeof value == 'undefined';
|
|
}
|
|
|
|
/**
|
|
* Recursively merges own enumerable properties of the source object(s), that
|
|
* don't resolve to `undefined`, into the destination object. Subsequent sources
|
|
* will overwrite property assignments of previous sources. If a `callback` function
|
|
* is passed, it will be executed to produce the merged values of the destination
|
|
* and source properties. If `callback` returns `undefined`, merging will be
|
|
* handled by the method instead. The `callback` is bound to `thisArg` and
|
|
* invoked with two arguments; (objectValue, sourceValue).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The destination object.
|
|
* @param {Object} [source1, source2, ...] The source objects.
|
|
* @param {Function} [callback] The function to customize merging properties.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @param- {Object} [deepIndicator] Indicates that `stackA` and `stackB` are
|
|
* arrays of traversed objects, instead of source objects.
|
|
* @param- {Array} [stackA=[]] Tracks traversed source objects.
|
|
* @param- {Array} [stackB=[]] Associates values with source counterparts.
|
|
* @returns {Object} Returns the destination object.
|
|
* @example
|
|
*
|
|
* var names = {
|
|
* 'stooges': [
|
|
* { 'name': 'moe' },
|
|
* { 'name': 'larry' }
|
|
* ]
|
|
* };
|
|
*
|
|
* var ages = {
|
|
* 'stooges': [
|
|
* { 'age': 40 },
|
|
* { 'age': 50 }
|
|
* ]
|
|
* };
|
|
*
|
|
* _.merge(names, ages);
|
|
* // => { 'stooges': [{ 'name': 'moe', 'age': 40 }, { 'name': 'larry', 'age': 50 }] }
|
|
*
|
|
* var food = {
|
|
* 'fruits': ['apple'],
|
|
* 'vegetables': ['beet']
|
|
* };
|
|
*
|
|
* var otherFood = {
|
|
* 'fruits': ['banana'],
|
|
* 'vegetables': ['carrot']
|
|
* };
|
|
*
|
|
* _.merge(food, otherFood, function(a, b) {
|
|
* return _.isArray(a) ? a.concat(b) : undefined;
|
|
* });
|
|
* // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot] }
|
|
*/
|
|
function merge(object, source, deepIndicator) {
|
|
var args = arguments,
|
|
index = 0,
|
|
length = 2;
|
|
|
|
if (!isObject(object)) {
|
|
return object;
|
|
}
|
|
if (deepIndicator === indicatorObject) {
|
|
var callback = args[3],
|
|
stackA = args[4],
|
|
stackB = args[5];
|
|
} else {
|
|
var initedStack = true;
|
|
stackA = getArray();
|
|
stackB = getArray();
|
|
|
|
// allows working with `_.reduce` and `_.reduceRight` without
|
|
// using their `callback` arguments, `index|key` and `collection`
|
|
if (typeof deepIndicator != 'number') {
|
|
length = args.length;
|
|
}
|
|
if (length > 3 && typeof args[length - 2] == 'function') {
|
|
callback = lodash.createCallback(args[--length - 1], args[length--], 2);
|
|
} else if (length > 2 && typeof args[length - 1] == 'function') {
|
|
callback = args[--length];
|
|
}
|
|
}
|
|
while (++index < length) {
|
|
(isArray(args[index]) ? forEach : forOwn)(args[index], function(source, key) {
|
|
var found,
|
|
isArr,
|
|
result = source,
|
|
value = object[key];
|
|
|
|
if (source && ((isArr = isArray(source)) || isPlainObject(source))) {
|
|
// avoid merging previously merged cyclic sources
|
|
var stackLength = stackA.length;
|
|
while (stackLength--) {
|
|
if ((found = stackA[stackLength] == source)) {
|
|
value = stackB[stackLength];
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
var isShallow;
|
|
if (callback) {
|
|
result = callback(value, source);
|
|
if ((isShallow = typeof result != 'undefined')) {
|
|
value = result;
|
|
}
|
|
}
|
|
if (!isShallow) {
|
|
value = isArr
|
|
? (isArray(value) ? value : [])
|
|
: (isPlainObject(value) ? value : {});
|
|
}
|
|
// add `source` and associated `value` to the stack of traversed objects
|
|
stackA.push(source);
|
|
stackB.push(value);
|
|
|
|
// recursively merge objects and arrays (susceptible to call stack limits)
|
|
if (!isShallow) {
|
|
value = merge(value, source, indicatorObject, callback, stackA, stackB);
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
if (callback) {
|
|
result = callback(value, source);
|
|
if (typeof result == 'undefined') {
|
|
result = source;
|
|
}
|
|
}
|
|
if (typeof result != 'undefined') {
|
|
value = result;
|
|
}
|
|
}
|
|
object[key] = value;
|
|
});
|
|
}
|
|
|
|
if (initedStack) {
|
|
releaseArray(stackA);
|
|
releaseArray(stackB);
|
|
}
|
|
return object;
|
|
}
|
|
|
|
/**
|
|
* Creates a shallow clone of `object` excluding the specified properties.
|
|
* Property names may be specified as individual arguments or as arrays of
|
|
* property names. If a `callback` function is passed, it will be executed
|
|
* for each property in the `object`, omitting the properties `callback`
|
|
* returns truthy for. The `callback` is bound to `thisArg` and invoked
|
|
* with three arguments; (value, key, object).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The source object.
|
|
* @param {Function|String} callback|[prop1, prop2, ...] The properties to omit
|
|
* or the function called per iteration.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns an object without the omitted properties.
|
|
* @example
|
|
*
|
|
* _.omit({ 'name': 'moe', 'age': 40 }, 'age');
|
|
* // => { 'name': 'moe' }
|
|
*
|
|
* _.omit({ 'name': 'moe', 'age': 40 }, function(value) {
|
|
* return typeof value == 'number';
|
|
* });
|
|
* // => { 'name': 'moe' }
|
|
*/
|
|
function omit(object, callback, thisArg) {
|
|
var indexOf = getIndexOf(),
|
|
isFunc = typeof callback == 'function',
|
|
result = {};
|
|
|
|
if (isFunc) {
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
} else {
|
|
var props = concat.apply(arrayRef, nativeSlice.call(arguments, 1));
|
|
}
|
|
forIn(object, function(value, key, object) {
|
|
if (isFunc
|
|
? !callback(value, key, object)
|
|
: indexOf(props, key) < 0
|
|
) {
|
|
result[key] = value;
|
|
}
|
|
});
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates a two dimensional array of the given object's key-value pairs,
|
|
* i.e. `[[key1, value1], [key2, value2]]`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The object to inspect.
|
|
* @returns {Array} Returns new array of key-value pairs.
|
|
* @example
|
|
*
|
|
* _.pairs({ 'moe': 30, 'larry': 40 });
|
|
* // => [['moe', 30], ['larry', 40]] (order is not guaranteed)
|
|
*/
|
|
function pairs(object) {
|
|
var index = -1,
|
|
props = keys(object),
|
|
length = props.length,
|
|
result = Array(length);
|
|
|
|
while (++index < length) {
|
|
var key = props[index];
|
|
result[index] = [key, object[key]];
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates a shallow clone of `object` composed of the specified properties.
|
|
* Property names may be specified as individual arguments or as arrays of property
|
|
* names. If `callback` is passed, it will be executed for each property in the
|
|
* `object`, picking the properties `callback` returns truthy for. The `callback`
|
|
* is bound to `thisArg` and invoked with three arguments; (value, key, object).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The source object.
|
|
* @param {Array|Function|String} callback|[prop1, prop2, ...] The function called
|
|
* per iteration or properties to pick, either as individual arguments or arrays.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns an object composed of the picked properties.
|
|
* @example
|
|
*
|
|
* _.pick({ 'name': 'moe', '_userid': 'moe1' }, 'name');
|
|
* // => { 'name': 'moe' }
|
|
*
|
|
* _.pick({ 'name': 'moe', '_userid': 'moe1' }, function(value, key) {
|
|
* return key.charAt(0) != '_';
|
|
* });
|
|
* // => { 'name': 'moe' }
|
|
*/
|
|
function pick(object, callback, thisArg) {
|
|
var result = {};
|
|
if (typeof callback != 'function') {
|
|
var index = -1,
|
|
props = concat.apply(arrayRef, nativeSlice.call(arguments, 1)),
|
|
length = isObject(object) ? props.length : 0;
|
|
|
|
while (++index < length) {
|
|
var key = props[index];
|
|
if (key in object) {
|
|
result[key] = object[key];
|
|
}
|
|
}
|
|
} else {
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
forIn(object, function(value, key, object) {
|
|
if (callback(value, key, object)) {
|
|
result[key] = value;
|
|
}
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* An alternative to `_.reduce`, this method transforms an `object` to a new
|
|
* `accumulator` object which is the result of running each of its elements
|
|
* through the `callback`, with each `callback` execution potentially mutating
|
|
* the `accumulator` object. The `callback` is bound to `thisArg` and invoked
|
|
* with four arguments; (accumulator, value, key, object). Callbacks may exit
|
|
* iteration early by explicitly returning `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Array|Object} collection The collection to iterate over.
|
|
* @param {Function} [callback=identity] The function called per iteration.
|
|
* @param {Mixed} [accumulator] The custom accumulator value.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the accumulated value.
|
|
* @example
|
|
*
|
|
* var squares = _.transform([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], function(result, num) {
|
|
* num *= num;
|
|
* if (num % 2) {
|
|
* return result.push(num) < 3;
|
|
* }
|
|
* });
|
|
* // => [1, 9, 25]
|
|
*
|
|
* var mapped = _.transform({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {
|
|
* result[key] = num * 3;
|
|
* });
|
|
* // => { 'a': 3, 'b': 6, 'c': 9 }
|
|
*/
|
|
function transform(object, callback, accumulator, thisArg) {
|
|
var isArr = isArray(object);
|
|
callback = lodash.createCallback(callback, thisArg, 4);
|
|
|
|
if (accumulator == null) {
|
|
if (isArr) {
|
|
accumulator = [];
|
|
} else {
|
|
var ctor = object && object.constructor,
|
|
proto = ctor && ctor.prototype;
|
|
|
|
accumulator = createObject(proto);
|
|
}
|
|
}
|
|
(isArr ? basicEach : forOwn)(object, function(value, index, object) {
|
|
return callback(accumulator, value, index, object);
|
|
});
|
|
return accumulator;
|
|
}
|
|
|
|
/**
|
|
* Creates an array composed of the own enumerable property values of `object`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Objects
|
|
* @param {Object} object The object to inspect.
|
|
* @returns {Array} Returns a new array of property values.
|
|
* @example
|
|
*
|
|
* _.values({ 'one': 1, 'two': 2, 'three': 3 });
|
|
* // => [1, 2, 3] (order is not guaranteed)
|
|
*/
|
|
function values(object) {
|
|
var index = -1,
|
|
props = keys(object),
|
|
length = props.length,
|
|
result = Array(length);
|
|
|
|
while (++index < length) {
|
|
result[index] = object[props[index]];
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Creates an array of elements from the specified indexes, or keys, of the
|
|
* `collection`. Indexes may be specified as individual arguments or as arrays
|
|
* of indexes.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Array|Number|String} [index1, index2, ...] The indexes of
|
|
* `collection` to retrieve, either as individual arguments or arrays.
|
|
* @returns {Array} Returns a new array of elements corresponding to the
|
|
* provided indexes.
|
|
* @example
|
|
*
|
|
* _.at(['a', 'b', 'c', 'd', 'e'], [0, 2, 4]);
|
|
* // => ['a', 'c', 'e']
|
|
*
|
|
* _.at(['moe', 'larry', 'curly'], 0, 2);
|
|
* // => ['moe', 'curly']
|
|
*/
|
|
function at(collection) {
|
|
var index = -1,
|
|
props = concat.apply(arrayRef, nativeSlice.call(arguments, 1)),
|
|
length = props.length,
|
|
result = Array(length);
|
|
|
|
if (support.unindexedChars && isString(collection)) {
|
|
collection = collection.split('');
|
|
}
|
|
while(++index < length) {
|
|
result[index] = collection[props[index]];
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Checks if a given `target` element is present in a `collection` using strict
|
|
* equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used
|
|
* as the offset from the end of the collection.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias include
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Mixed} target The value to check for.
|
|
* @param {Number} [fromIndex=0] The index to search from.
|
|
* @returns {Boolean} Returns `true` if the `target` element is found, else `false`.
|
|
* @example
|
|
*
|
|
* _.contains([1, 2, 3], 1);
|
|
* // => true
|
|
*
|
|
* _.contains([1, 2, 3], 1, 2);
|
|
* // => false
|
|
*
|
|
* _.contains({ 'name': 'moe', 'age': 40 }, 'moe');
|
|
* // => true
|
|
*
|
|
* _.contains('curly', 'ur');
|
|
* // => true
|
|
*/
|
|
function contains(collection, target, fromIndex) {
|
|
var index = -1,
|
|
indexOf = getIndexOf(),
|
|
length = collection ? collection.length : 0,
|
|
result = false;
|
|
|
|
fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex) || 0;
|
|
if (length && typeof length == 'number') {
|
|
result = (isString(collection)
|
|
? collection.indexOf(target, fromIndex)
|
|
: indexOf(collection, target, fromIndex)
|
|
) > -1;
|
|
} else {
|
|
basicEach(collection, function(value) {
|
|
if (++index >= fromIndex) {
|
|
return !(result = value === target);
|
|
}
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates an object composed of keys returned from running each element of the
|
|
* `collection` through the given `callback`. The corresponding value of each key
|
|
* is the number of times the key was returned by the `callback`. The `callback`
|
|
* is bound to `thisArg` and invoked with three arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns the composed aggregate object.
|
|
* @example
|
|
*
|
|
* _.countBy([4.3, 6.1, 6.4], function(num) { return Math.floor(num); });
|
|
* // => { '4': 1, '6': 2 }
|
|
*
|
|
* _.countBy([4.3, 6.1, 6.4], function(num) { return this.floor(num); }, Math);
|
|
* // => { '4': 1, '6': 2 }
|
|
*
|
|
* _.countBy(['one', 'two', 'three'], 'length');
|
|
* // => { '3': 2, '5': 1 }
|
|
*/
|
|
function countBy(collection, callback, thisArg) {
|
|
var result = {};
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
|
|
forEach(collection, function(value, key, collection) {
|
|
key = String(callback(value, key, collection));
|
|
(hasOwnProperty.call(result, key) ? result[key]++ : result[key] = 1);
|
|
});
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Checks if the `callback` returns a truthy value for **all** elements of a
|
|
* `collection`. The `callback` is bound to `thisArg` and invoked with three
|
|
* arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias all
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Boolean} Returns `true` if all elements pass the callback check,
|
|
* else `false`.
|
|
* @example
|
|
*
|
|
* _.every([true, 1, null, 'yes'], Boolean);
|
|
* // => false
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.every(stooges, 'age');
|
|
* // => true
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.every(stooges, { 'age': 50 });
|
|
* // => false
|
|
*/
|
|
function every(collection, callback, thisArg) {
|
|
var result = true;
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
|
|
if (isArray(collection)) {
|
|
var index = -1,
|
|
length = collection.length;
|
|
|
|
while (++index < length) {
|
|
if (!(result = !!callback(collection[index], index, collection))) {
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
basicEach(collection, function(value, index, collection) {
|
|
return (result = !!callback(value, index, collection));
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Examines each element in a `collection`, returning an array of all elements
|
|
* the `callback` returns truthy for. The `callback` is bound to `thisArg` and
|
|
* invoked with three arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias select
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a new array of elements that passed the callback check.
|
|
* @example
|
|
*
|
|
* var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
|
|
* // => [2, 4, 6]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'apple', 'organic': false, 'type': 'fruit' },
|
|
* { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.filter(food, 'organic');
|
|
* // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }]
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.filter(food, { 'type': 'fruit' });
|
|
* // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }]
|
|
*/
|
|
function filter(collection, callback, thisArg) {
|
|
var result = [];
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
|
|
if (isArray(collection)) {
|
|
var index = -1,
|
|
length = collection.length;
|
|
|
|
while (++index < length) {
|
|
var value = collection[index];
|
|
if (callback(value, index, collection)) {
|
|
result.push(value);
|
|
}
|
|
}
|
|
} else {
|
|
basicEach(collection, function(value, index, collection) {
|
|
if (callback(value, index, collection)) {
|
|
result.push(value);
|
|
}
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Examines each element in a `collection`, returning the first that the `callback`
|
|
* returns truthy for. The `callback` is bound to `thisArg` and invoked with three
|
|
* arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias detect, findWhere
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the found element, else `undefined`.
|
|
* @example
|
|
*
|
|
* _.find([1, 2, 3, 4], function(num) {
|
|
* return num % 2 == 0;
|
|
* });
|
|
* // => 2
|
|
*
|
|
* var food = [
|
|
* { 'name': 'apple', 'organic': false, 'type': 'fruit' },
|
|
* { 'name': 'banana', 'organic': true, 'type': 'fruit' },
|
|
* { 'name': 'beet', 'organic': false, 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.find(food, { 'type': 'vegetable' });
|
|
* // => { 'name': 'beet', 'organic': false, 'type': 'vegetable' }
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.find(food, 'organic');
|
|
* // => { 'name': 'banana', 'organic': true, 'type': 'fruit' }
|
|
*/
|
|
function find(collection, callback, thisArg) {
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
|
|
if (isArray(collection)) {
|
|
var index = -1,
|
|
length = collection.length;
|
|
|
|
while (++index < length) {
|
|
var value = collection[index];
|
|
if (callback(value, index, collection)) {
|
|
return value;
|
|
}
|
|
}
|
|
} else {
|
|
var result;
|
|
basicEach(collection, function(value, index, collection) {
|
|
if (callback(value, index, collection)) {
|
|
result = value;
|
|
return false;
|
|
}
|
|
});
|
|
return result;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Iterates over a `collection`, executing the `callback` for each element in
|
|
* the `collection`. The `callback` is bound to `thisArg` and invoked with three
|
|
* arguments; (value, index|key, collection). Callbacks may exit iteration early
|
|
* by explicitly returning `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias each
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function} [callback=identity] The function called per iteration.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array|Object|String} Returns `collection`.
|
|
* @example
|
|
*
|
|
* _([1, 2, 3]).forEach(alert).join(',');
|
|
* // => alerts each number and returns '1,2,3'
|
|
*
|
|
* _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, alert);
|
|
* // => alerts each number value (order is not guaranteed)
|
|
*/
|
|
function forEach(collection, callback, thisArg) {
|
|
if (callback && typeof thisArg == 'undefined' && isArray(collection)) {
|
|
var index = -1,
|
|
length = collection.length;
|
|
|
|
while (++index < length) {
|
|
if (callback(collection[index], index, collection) === false) {
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
basicEach(collection, callback, thisArg);
|
|
}
|
|
return collection;
|
|
}
|
|
|
|
/**
|
|
* Creates an object composed of keys returned from running each element of the
|
|
* `collection` through the `callback`. The corresponding value of each key is
|
|
* an array of elements passed to `callback` that returned the key. The `callback`
|
|
* is bound to `thisArg` and invoked with three arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Object} Returns the composed aggregate object.
|
|
* @example
|
|
*
|
|
* _.groupBy([4.2, 6.1, 6.4], function(num) { return Math.floor(num); });
|
|
* // => { '4': [4.2], '6': [6.1, 6.4] }
|
|
*
|
|
* _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math);
|
|
* // => { '4': [4.2], '6': [6.1, 6.4] }
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.groupBy(['one', 'two', 'three'], 'length');
|
|
* // => { '3': ['one', 'two'], '5': ['three'] }
|
|
*/
|
|
function groupBy(collection, callback, thisArg) {
|
|
var result = {};
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
|
|
forEach(collection, function(value, key, collection) {
|
|
key = String(callback(value, key, collection));
|
|
(hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value);
|
|
});
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Invokes the method named by `methodName` on each element in the `collection`,
|
|
* returning an array of the results of each invoked method. Additional arguments
|
|
* will be passed to each invoked method. If `methodName` is a function, it will
|
|
* be invoked for, and `this` bound to, each element in the `collection`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|String} methodName The name of the method to invoke or
|
|
* the function invoked per iteration.
|
|
* @param {Mixed} [arg1, arg2, ...] Arguments to invoke the method with.
|
|
* @returns {Array} Returns a new array of the results of each invoked method.
|
|
* @example
|
|
*
|
|
* _.invoke([[5, 1, 7], [3, 2, 1]], 'sort');
|
|
* // => [[1, 5, 7], [1, 2, 3]]
|
|
*
|
|
* _.invoke([123, 456], String.prototype.split, '');
|
|
* // => [['1', '2', '3'], ['4', '5', '6']]
|
|
*/
|
|
function invoke(collection, methodName) {
|
|
var args = nativeSlice.call(arguments, 2),
|
|
index = -1,
|
|
isFunc = typeof methodName == 'function',
|
|
length = collection ? collection.length : 0,
|
|
result = Array(typeof length == 'number' ? length : 0);
|
|
|
|
forEach(collection, function(value) {
|
|
result[++index] = (isFunc ? methodName : value[methodName]).apply(value, args);
|
|
});
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates an array of values by running each element in the `collection`
|
|
* through the `callback`. The `callback` is bound to `thisArg` and invoked with
|
|
* three arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias collect
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a new array of the results of each `callback` execution.
|
|
* @example
|
|
*
|
|
* _.map([1, 2, 3], function(num) { return num * 3; });
|
|
* // => [3, 6, 9]
|
|
*
|
|
* _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; });
|
|
* // => [3, 6, 9] (order is not guaranteed)
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.map(stooges, 'name');
|
|
* // => ['moe', 'larry']
|
|
*/
|
|
function map(collection, callback, thisArg) {
|
|
var index = -1,
|
|
length = collection ? collection.length : 0,
|
|
result = Array(typeof length == 'number' ? length : 0);
|
|
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
if (isArray(collection)) {
|
|
while (++index < length) {
|
|
result[index] = callback(collection[index], index, collection);
|
|
}
|
|
} else {
|
|
basicEach(collection, function(value, key, collection) {
|
|
result[++index] = callback(value, key, collection);
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Retrieves the maximum value of an `array`. If `callback` is passed,
|
|
* it will be executed for each value in the `array` to generate the
|
|
* criterion by which the value is ranked. The `callback` is bound to
|
|
* `thisArg` and invoked with three arguments; (value, index, collection).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the maximum value.
|
|
* @example
|
|
*
|
|
* _.max([4, 2, 8, 6]);
|
|
* // => 8
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* _.max(stooges, function(stooge) { return stooge.age; });
|
|
* // => { 'name': 'larry', 'age': 50 };
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.max(stooges, 'age');
|
|
* // => { 'name': 'larry', 'age': 50 };
|
|
*/
|
|
function max(collection, callback, thisArg) {
|
|
var computed = -Infinity,
|
|
result = computed;
|
|
|
|
if (!callback && isArray(collection)) {
|
|
var index = -1,
|
|
length = collection.length;
|
|
|
|
while (++index < length) {
|
|
var value = collection[index];
|
|
if (value > result) {
|
|
result = value;
|
|
}
|
|
}
|
|
} else {
|
|
callback = (!callback && isString(collection))
|
|
? charAtCallback
|
|
: lodash.createCallback(callback, thisArg);
|
|
|
|
basicEach(collection, function(value, index, collection) {
|
|
var current = callback(value, index, collection);
|
|
if (current > computed) {
|
|
computed = current;
|
|
result = value;
|
|
}
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Retrieves the minimum value of an `array`. If `callback` is passed,
|
|
* it will be executed for each value in the `array` to generate the
|
|
* criterion by which the value is ranked. The `callback` is bound to `thisArg`
|
|
* and invoked with three arguments; (value, index, collection).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the minimum value.
|
|
* @example
|
|
*
|
|
* _.min([4, 2, 8, 6]);
|
|
* // => 2
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* _.min(stooges, function(stooge) { return stooge.age; });
|
|
* // => { 'name': 'moe', 'age': 40 };
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.min(stooges, 'age');
|
|
* // => { 'name': 'moe', 'age': 40 };
|
|
*/
|
|
function min(collection, callback, thisArg) {
|
|
var computed = Infinity,
|
|
result = computed;
|
|
|
|
if (!callback && isArray(collection)) {
|
|
var index = -1,
|
|
length = collection.length;
|
|
|
|
while (++index < length) {
|
|
var value = collection[index];
|
|
if (value < result) {
|
|
result = value;
|
|
}
|
|
}
|
|
} else {
|
|
callback = (!callback && isString(collection))
|
|
? charAtCallback
|
|
: lodash.createCallback(callback, thisArg);
|
|
|
|
basicEach(collection, function(value, index, collection) {
|
|
var current = callback(value, index, collection);
|
|
if (current < computed) {
|
|
computed = current;
|
|
result = value;
|
|
}
|
|
});
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Retrieves the value of a specified property from all elements in the `collection`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Function
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {String} property The property to pluck.
|
|
* @returns {Array} Returns a new array of property values.
|
|
* @example
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* _.pluck(stooges, 'name');
|
|
* // => ['moe', 'larry']
|
|
*/
|
|
var pluck = map;
|
|
|
|
/**
|
|
* Reduces a `collection` to a value which is the accumulated result of running
|
|
* each element in the `collection` through the `callback`, where each successive
|
|
* `callback` execution consumes the return value of the previous execution.
|
|
* If `accumulator` is not passed, the first element of the `collection` will be
|
|
* used as the initial `accumulator` value. The `callback` is bound to `thisArg`
|
|
* and invoked with four arguments; (accumulator, value, index|key, collection).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias foldl, inject
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function} [callback=identity] The function called per iteration.
|
|
* @param {Mixed} [accumulator] Initial value of the accumulator.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the accumulated value.
|
|
* @example
|
|
*
|
|
* var sum = _.reduce([1, 2, 3], function(sum, num) {
|
|
* return sum + num;
|
|
* });
|
|
* // => 6
|
|
*
|
|
* var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) {
|
|
* result[key] = num * 3;
|
|
* return result;
|
|
* }, {});
|
|
* // => { 'a': 3, 'b': 6, 'c': 9 }
|
|
*/
|
|
function reduce(collection, callback, accumulator, thisArg) {
|
|
var noaccum = arguments.length < 3;
|
|
callback = lodash.createCallback(callback, thisArg, 4);
|
|
|
|
if (isArray(collection)) {
|
|
var index = -1,
|
|
length = collection.length;
|
|
|
|
if (noaccum) {
|
|
accumulator = collection[++index];
|
|
}
|
|
while (++index < length) {
|
|
accumulator = callback(accumulator, collection[index], index, collection);
|
|
}
|
|
} else {
|
|
basicEach(collection, function(value, index, collection) {
|
|
accumulator = noaccum
|
|
? (noaccum = false, value)
|
|
: callback(accumulator, value, index, collection)
|
|
});
|
|
}
|
|
return accumulator;
|
|
}
|
|
|
|
/**
|
|
* This method is similar to `_.reduce`, except that it iterates over a
|
|
* `collection` from right to left.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias foldr
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function} [callback=identity] The function called per iteration.
|
|
* @param {Mixed} [accumulator] Initial value of the accumulator.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the accumulated value.
|
|
* @example
|
|
*
|
|
* var list = [[0, 1], [2, 3], [4, 5]];
|
|
* var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []);
|
|
* // => [4, 5, 2, 3, 0, 1]
|
|
*/
|
|
function reduceRight(collection, callback, accumulator, thisArg) {
|
|
var iterable = collection,
|
|
length = collection ? collection.length : 0,
|
|
noaccum = arguments.length < 3;
|
|
|
|
if (typeof length != 'number') {
|
|
var props = keys(collection);
|
|
length = props.length;
|
|
} else if (support.unindexedChars && isString(collection)) {
|
|
iterable = collection.split('');
|
|
}
|
|
callback = lodash.createCallback(callback, thisArg, 4);
|
|
forEach(collection, function(value, index, collection) {
|
|
index = props ? props[--length] : --length;
|
|
accumulator = noaccum
|
|
? (noaccum = false, iterable[index])
|
|
: callback(accumulator, iterable[index], index, collection);
|
|
});
|
|
return accumulator;
|
|
}
|
|
|
|
/**
|
|
* The opposite of `_.filter`, this method returns the elements of a
|
|
* `collection` that `callback` does **not** return truthy for.
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a new array of elements that did **not** pass the
|
|
* callback check.
|
|
* @example
|
|
*
|
|
* var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; });
|
|
* // => [1, 3, 5]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'apple', 'organic': false, 'type': 'fruit' },
|
|
* { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.reject(food, 'organic');
|
|
* // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }]
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.reject(food, { 'type': 'fruit' });
|
|
* // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }]
|
|
*/
|
|
function reject(collection, callback, thisArg) {
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
return filter(collection, function(value, index, collection) {
|
|
return !callback(value, index, collection);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Creates an array of shuffled `array` values, using a version of the
|
|
* Fisher-Yates shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to shuffle.
|
|
* @returns {Array} Returns a new shuffled collection.
|
|
* @example
|
|
*
|
|
* _.shuffle([1, 2, 3, 4, 5, 6]);
|
|
* // => [4, 1, 6, 3, 5, 2]
|
|
*/
|
|
function shuffle(collection) {
|
|
var index = -1,
|
|
length = collection ? collection.length : 0,
|
|
result = Array(typeof length == 'number' ? length : 0);
|
|
|
|
forEach(collection, function(value) {
|
|
var rand = floor(nativeRandom() * (++index + 1));
|
|
result[index] = result[rand];
|
|
result[rand] = value;
|
|
});
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Gets the size of the `collection` by returning `collection.length` for arrays
|
|
* and array-like objects or the number of own enumerable properties for objects.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to inspect.
|
|
* @returns {Number} Returns `collection.length` or number of own enumerable properties.
|
|
* @example
|
|
*
|
|
* _.size([1, 2]);
|
|
* // => 2
|
|
*
|
|
* _.size({ 'one': 1, 'two': 2, 'three': 3 });
|
|
* // => 3
|
|
*
|
|
* _.size('curly');
|
|
* // => 5
|
|
*/
|
|
function size(collection) {
|
|
var length = collection ? collection.length : 0;
|
|
return typeof length == 'number' ? length : keys(collection).length;
|
|
}
|
|
|
|
/**
|
|
* Checks if the `callback` returns a truthy value for **any** element of a
|
|
* `collection`. The function returns as soon as it finds passing value, and
|
|
* does not iterate over the entire `collection`. The `callback` is bound to
|
|
* `thisArg` and invoked with three arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias any
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Boolean} Returns `true` if any element passes the callback check,
|
|
* else `false`.
|
|
* @example
|
|
*
|
|
* _.some([null, 0, 'yes', false], Boolean);
|
|
* // => true
|
|
*
|
|
* var food = [
|
|
* { 'name': 'apple', 'organic': false, 'type': 'fruit' },
|
|
* { 'name': 'carrot', 'organic': true, 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.some(food, 'organic');
|
|
* // => true
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.some(food, { 'type': 'meat' });
|
|
* // => false
|
|
*/
|
|
function some(collection, callback, thisArg) {
|
|
var result;
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
|
|
if (isArray(collection)) {
|
|
var index = -1,
|
|
length = collection.length;
|
|
|
|
while (++index < length) {
|
|
if ((result = callback(collection[index], index, collection))) {
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
basicEach(collection, function(value, index, collection) {
|
|
return !(result = callback(value, index, collection));
|
|
});
|
|
}
|
|
return !!result;
|
|
}
|
|
|
|
/**
|
|
* Creates an array of elements, sorted in ascending order by the results of
|
|
* running each element in the `collection` through the `callback`. This method
|
|
* performs a stable sort, that is, it will preserve the original sort order of
|
|
* equal elements. The `callback` is bound to `thisArg` and invoked with three
|
|
* arguments; (value, index|key, collection).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a new array of sorted elements.
|
|
* @example
|
|
*
|
|
* _.sortBy([1, 2, 3], function(num) { return Math.sin(num); });
|
|
* // => [3, 1, 2]
|
|
*
|
|
* _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math);
|
|
* // => [3, 1, 2]
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.sortBy(['banana', 'strawberry', 'apple'], 'length');
|
|
* // => ['apple', 'banana', 'strawberry']
|
|
*/
|
|
function sortBy(collection, callback, thisArg) {
|
|
var index = -1,
|
|
length = collection ? collection.length : 0,
|
|
result = Array(typeof length == 'number' ? length : 0);
|
|
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
forEach(collection, function(value, key, collection) {
|
|
var object = result[++index] = getObject();
|
|
object.criteria = callback(value, key, collection);
|
|
object.index = index;
|
|
object.value = value;
|
|
});
|
|
|
|
length = result.length;
|
|
result.sort(compareAscending);
|
|
while (length--) {
|
|
var object = result[length];
|
|
result[length] = object.value;
|
|
releaseObject(object);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Converts the `collection` to an array.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to convert.
|
|
* @returns {Array} Returns the new converted array.
|
|
* @example
|
|
*
|
|
* (function() { return _.toArray(arguments).slice(1); })(1, 2, 3, 4);
|
|
* // => [2, 3, 4]
|
|
*/
|
|
function toArray(collection) {
|
|
if (collection && typeof collection.length == 'number') {
|
|
return (support.unindexedChars && isString(collection))
|
|
? collection.split('')
|
|
: slice(collection);
|
|
}
|
|
return values(collection);
|
|
}
|
|
|
|
/**
|
|
* Examines each element in a `collection`, returning an array of all elements
|
|
* that have the given `properties`. When checking `properties`, this method
|
|
* performs a deep comparison between values to determine if they are equivalent
|
|
* to each other.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type Function
|
|
* @category Collections
|
|
* @param {Array|Object|String} collection The collection to iterate over.
|
|
* @param {Object} properties The object of property values to filter by.
|
|
* @returns {Array} Returns a new array of elements that have the given `properties`.
|
|
* @example
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* _.where(stooges, { 'age': 40 });
|
|
* // => [{ 'name': 'moe', 'age': 40 }]
|
|
*/
|
|
var where = filter;
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Creates an array with all falsey values of `array` removed. The values
|
|
* `false`, `null`, `0`, `""`, `undefined` and `NaN` are all falsey.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to compact.
|
|
* @returns {Array} Returns a new filtered array.
|
|
* @example
|
|
*
|
|
* _.compact([0, 1, false, 2, '', 3]);
|
|
* // => [1, 2, 3]
|
|
*/
|
|
function compact(array) {
|
|
var index = -1,
|
|
length = array ? array.length : 0,
|
|
result = [];
|
|
|
|
while (++index < length) {
|
|
var value = array[index];
|
|
if (value) {
|
|
result.push(value);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates an array of `array` elements not present in the other arrays
|
|
* using strict equality for comparisons, i.e. `===`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to process.
|
|
* @param {Array} [array1, array2, ...] Arrays to check.
|
|
* @returns {Array} Returns a new array of `array` elements not present in the
|
|
* other arrays.
|
|
* @example
|
|
*
|
|
* _.difference([1, 2, 3, 4, 5], [5, 2, 10]);
|
|
* // => [1, 3, 4]
|
|
*/
|
|
function difference(array) {
|
|
var index = -1,
|
|
indexOf = getIndexOf(),
|
|
length = array ? array.length : 0,
|
|
seen = concat.apply(arrayRef, nativeSlice.call(arguments, 1)),
|
|
result = [];
|
|
|
|
var isLarge = length >= largeArraySize && indexOf === basicIndexOf;
|
|
|
|
if (isLarge) {
|
|
var cache = createCache(seen);
|
|
if (cache) {
|
|
indexOf = cacheIndexOf;
|
|
seen = cache;
|
|
} else {
|
|
isLarge = false;
|
|
}
|
|
}
|
|
while (++index < length) {
|
|
var value = array[index];
|
|
if (indexOf(seen, value) < 0) {
|
|
result.push(value);
|
|
}
|
|
}
|
|
if (isLarge) {
|
|
releaseObject(seen);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* This method is similar to `_.find`, except that it returns the index of
|
|
* the element that passes the callback check, instead of the element itself.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to search.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the index of the found element, else `-1`.
|
|
* @example
|
|
*
|
|
* _.findIndex(['apple', 'banana', 'beet'], function(food) {
|
|
* return /^b/.test(food);
|
|
* });
|
|
* // => 1
|
|
*/
|
|
function findIndex(array, callback, thisArg) {
|
|
var index = -1,
|
|
length = array ? array.length : 0;
|
|
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
while (++index < length) {
|
|
if (callback(array[index], index, array)) {
|
|
return index;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* Gets the first element of the `array`. If a number `n` is passed, the first
|
|
* `n` elements of the `array` are returned. If a `callback` function is passed,
|
|
* elements at the beginning of the array are returned as long as the `callback`
|
|
* returns truthy. The `callback` is bound to `thisArg` and invoked with three
|
|
* arguments; (value, index, array).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias head, take
|
|
* @category Arrays
|
|
* @param {Array} array The array to query.
|
|
* @param {Function|Object|Number|String} [callback|n] The function called
|
|
* per element or the number of elements to return. If a property name or
|
|
* object is passed, it will be used to create a "_.pluck" or "_.where"
|
|
* style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the first element(s) of `array`.
|
|
* @example
|
|
*
|
|
* _.first([1, 2, 3]);
|
|
* // => 1
|
|
*
|
|
* _.first([1, 2, 3], 2);
|
|
* // => [1, 2]
|
|
*
|
|
* _.first([1, 2, 3], function(num) {
|
|
* return num < 3;
|
|
* });
|
|
* // => [1, 2]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'banana', 'organic': true },
|
|
* { 'name': 'beet', 'organic': false },
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.first(food, 'organic');
|
|
* // => [{ 'name': 'banana', 'organic': true }]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'apple', 'type': 'fruit' },
|
|
* { 'name': 'banana', 'type': 'fruit' },
|
|
* { 'name': 'beet', 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.first(food, { 'type': 'fruit' });
|
|
* // => [{ 'name': 'apple', 'type': 'fruit' }, { 'name': 'banana', 'type': 'fruit' }]
|
|
*/
|
|
function first(array, callback, thisArg) {
|
|
if (array) {
|
|
var n = 0,
|
|
length = array.length;
|
|
|
|
if (typeof callback != 'number' && callback != null) {
|
|
var index = -1;
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
while (++index < length && callback(array[index], index, array)) {
|
|
n++;
|
|
}
|
|
} else {
|
|
n = callback;
|
|
if (n == null || thisArg) {
|
|
return array[0];
|
|
}
|
|
}
|
|
return slice(array, 0, nativeMin(nativeMax(0, n), length));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Flattens a nested array (the nesting can be to any depth). If `isShallow`
|
|
* is truthy, `array` will only be flattened a single level. If `callback`
|
|
* is passed, each element of `array` is passed through a `callback` before
|
|
* flattening. The `callback` is bound to `thisArg` and invoked with three
|
|
* arguments; (value, index, array).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to flatten.
|
|
* @param {Boolean} [isShallow=false] A flag to indicate only flattening a single level.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a new flattened array.
|
|
* @example
|
|
*
|
|
* _.flatten([1, [2], [3, [[4]]]]);
|
|
* // => [1, 2, 3, 4];
|
|
*
|
|
* _.flatten([1, [2], [3, [[4]]]], true);
|
|
* // => [1, 2, 3, [[4]]];
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'curly', 'quotes': ['Oh, a wise guy, eh?', 'Poifect!'] },
|
|
* { 'name': 'moe', 'quotes': ['Spread out!', 'You knucklehead!'] }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.flatten(stooges, 'quotes');
|
|
* // => ['Oh, a wise guy, eh?', 'Poifect!', 'Spread out!', 'You knucklehead!']
|
|
*/
|
|
var flatten = overloadWrapper(function flatten(array, isShallow, callback) {
|
|
var index = -1,
|
|
length = array ? array.length : 0,
|
|
result = [];
|
|
|
|
while (++index < length) {
|
|
var value = array[index];
|
|
if (callback) {
|
|
value = callback(value, index, array);
|
|
}
|
|
// recursively flatten arrays (susceptible to call stack limits)
|
|
if (isArray(value)) {
|
|
push.apply(result, isShallow ? value : flatten(value));
|
|
} else {
|
|
result.push(value);
|
|
}
|
|
}
|
|
return result;
|
|
});
|
|
|
|
/**
|
|
* Gets the index at which the first occurrence of `value` is found using
|
|
* strict equality for comparisons, i.e. `===`. If the `array` is already
|
|
* sorted, passing `true` for `fromIndex` will run a faster binary search.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to search.
|
|
* @param {Mixed} value The value to search for.
|
|
* @param {Boolean|Number} [fromIndex=0] The index to search from or `true` to
|
|
* perform a binary search on a sorted `array`.
|
|
* @returns {Number} Returns the index of the matched value or `-1`.
|
|
* @example
|
|
*
|
|
* _.indexOf([1, 2, 3, 1, 2, 3], 2);
|
|
* // => 1
|
|
*
|
|
* _.indexOf([1, 2, 3, 1, 2, 3], 2, 3);
|
|
* // => 4
|
|
*
|
|
* _.indexOf([1, 1, 2, 2, 3, 3], 2, true);
|
|
* // => 2
|
|
*/
|
|
function indexOf(array, value, fromIndex) {
|
|
if (typeof fromIndex == 'number') {
|
|
var length = array ? array.length : 0;
|
|
fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0);
|
|
} else if (fromIndex) {
|
|
var index = sortedIndex(array, value);
|
|
return array[index] === value ? index : -1;
|
|
}
|
|
return array ? basicIndexOf(array, value, fromIndex) : -1;
|
|
}
|
|
|
|
/**
|
|
* Gets all but the last element of `array`. If a number `n` is passed, the
|
|
* last `n` elements are excluded from the result. If a `callback` function
|
|
* is passed, elements at the end of the array are excluded from the result
|
|
* as long as the `callback` returns truthy. The `callback` is bound to
|
|
* `thisArg` and invoked with three arguments; (value, index, array).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to query.
|
|
* @param {Function|Object|Number|String} [callback|n=1] The function called
|
|
* per element or the number of elements to exclude. If a property name or
|
|
* object is passed, it will be used to create a "_.pluck" or "_.where"
|
|
* style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a slice of `array`.
|
|
* @example
|
|
*
|
|
* _.initial([1, 2, 3]);
|
|
* // => [1, 2]
|
|
*
|
|
* _.initial([1, 2, 3], 2);
|
|
* // => [1]
|
|
*
|
|
* _.initial([1, 2, 3], function(num) {
|
|
* return num > 1;
|
|
* });
|
|
* // => [1]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'beet', 'organic': false },
|
|
* { 'name': 'carrot', 'organic': true }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.initial(food, 'organic');
|
|
* // => [{ 'name': 'beet', 'organic': false }]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'banana', 'type': 'fruit' },
|
|
* { 'name': 'beet', 'type': 'vegetable' },
|
|
* { 'name': 'carrot', 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.initial(food, { 'type': 'vegetable' });
|
|
* // => [{ 'name': 'banana', 'type': 'fruit' }]
|
|
*/
|
|
function initial(array, callback, thisArg) {
|
|
if (!array) {
|
|
return [];
|
|
}
|
|
var n = 0,
|
|
length = array.length;
|
|
|
|
if (typeof callback != 'number' && callback != null) {
|
|
var index = length;
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
while (index-- && callback(array[index], index, array)) {
|
|
n++;
|
|
}
|
|
} else {
|
|
n = (callback == null || thisArg) ? 1 : callback || n;
|
|
}
|
|
return slice(array, 0, nativeMin(nativeMax(0, length - n), length));
|
|
}
|
|
|
|
/**
|
|
* Computes the intersection of all the passed-in arrays using strict equality
|
|
* for comparisons, i.e. `===`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} [array1, array2, ...] Arrays to process.
|
|
* @returns {Array} Returns a new array of unique elements that are present
|
|
* in **all** of the arrays.
|
|
* @example
|
|
*
|
|
* _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]);
|
|
* // => [1, 2]
|
|
*/
|
|
function intersection(array) {
|
|
var args = arguments,
|
|
argsLength = args.length,
|
|
argsIndex = -1,
|
|
caches = getArray(),
|
|
index = -1,
|
|
indexOf = getIndexOf(),
|
|
length = array ? array.length : 0,
|
|
result = [],
|
|
seen = getArray();
|
|
|
|
while (++argsIndex < argsLength) {
|
|
var value = args[argsIndex];
|
|
caches[argsIndex] = indexOf === basicIndexOf &&
|
|
(value ? value.length : 0) >= largeArraySize &&
|
|
createCache(argsIndex ? args[argsIndex] : seen);
|
|
}
|
|
outer:
|
|
while (++index < length) {
|
|
var cache = caches[0];
|
|
value = array[index];
|
|
|
|
if ((cache ? cacheIndexOf(cache, value) : indexOf(seen, value)) < 0) {
|
|
argsIndex = argsLength;
|
|
(cache || seen).push(value);
|
|
while (--argsIndex) {
|
|
cache = caches[argsIndex];
|
|
if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value)) < 0) {
|
|
continue outer;
|
|
}
|
|
}
|
|
result.push(value);
|
|
}
|
|
}
|
|
while (argsLength--) {
|
|
cache = caches[argsLength];
|
|
if (cache) {
|
|
releaseObject(cache);
|
|
}
|
|
}
|
|
releaseArray(caches);
|
|
releaseArray(seen);
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Gets the last element of the `array`. If a number `n` is passed, the
|
|
* last `n` elements of the `array` are returned. If a `callback` function
|
|
* is passed, elements at the end of the array are returned as long as the
|
|
* `callback` returns truthy. The `callback` is bound to `thisArg` and
|
|
* invoked with three arguments;(value, index, array).
|
|
*
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to query.
|
|
* @param {Function|Object|Number|String} [callback|n] The function called
|
|
* per element or the number of elements to return. If a property name or
|
|
* object is passed, it will be used to create a "_.pluck" or "_.where"
|
|
* style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Mixed} Returns the last element(s) of `array`.
|
|
* @example
|
|
*
|
|
* _.last([1, 2, 3]);
|
|
* // => 3
|
|
*
|
|
* _.last([1, 2, 3], 2);
|
|
* // => [2, 3]
|
|
*
|
|
* _.last([1, 2, 3], function(num) {
|
|
* return num > 1;
|
|
* });
|
|
* // => [2, 3]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'beet', 'organic': false },
|
|
* { 'name': 'carrot', 'organic': true }
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.last(food, 'organic');
|
|
* // => [{ 'name': 'carrot', 'organic': true }]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'banana', 'type': 'fruit' },
|
|
* { 'name': 'beet', 'type': 'vegetable' },
|
|
* { 'name': 'carrot', 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.last(food, { 'type': 'vegetable' });
|
|
* // => [{ 'name': 'beet', 'type': 'vegetable' }, { 'name': 'carrot', 'type': 'vegetable' }]
|
|
*/
|
|
function last(array, callback, thisArg) {
|
|
if (array) {
|
|
var n = 0,
|
|
length = array.length;
|
|
|
|
if (typeof callback != 'number' && callback != null) {
|
|
var index = length;
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
while (index-- && callback(array[index], index, array)) {
|
|
n++;
|
|
}
|
|
} else {
|
|
n = callback;
|
|
if (n == null || thisArg) {
|
|
return array[length - 1];
|
|
}
|
|
}
|
|
return slice(array, nativeMax(0, length - n));
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Gets the index at which the last occurrence of `value` is found using strict
|
|
* equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used
|
|
* as the offset from the end of the collection.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to search.
|
|
* @param {Mixed} value The value to search for.
|
|
* @param {Number} [fromIndex=array.length-1] The index to search from.
|
|
* @returns {Number} Returns the index of the matched value or `-1`.
|
|
* @example
|
|
*
|
|
* _.lastIndexOf([1, 2, 3, 1, 2, 3], 2);
|
|
* // => 4
|
|
*
|
|
* _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3);
|
|
* // => 1
|
|
*/
|
|
function lastIndexOf(array, value, fromIndex) {
|
|
var index = array ? array.length : 0;
|
|
if (typeof fromIndex == 'number') {
|
|
index = (fromIndex < 0 ? nativeMax(0, index + fromIndex) : nativeMin(fromIndex, index - 1)) + 1;
|
|
}
|
|
while (index--) {
|
|
if (array[index] === value) {
|
|
return index;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
/**
|
|
* Creates an array of numbers (positive and/or negative) progressing from
|
|
* `start` up to but not including `end`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Number} [start=0] The start of the range.
|
|
* @param {Number} end The end of the range.
|
|
* @param {Number} [step=1] The value to increment or decrement by.
|
|
* @returns {Array} Returns a new range array.
|
|
* @example
|
|
*
|
|
* _.range(10);
|
|
* // => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
|
|
*
|
|
* _.range(1, 11);
|
|
* // => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
|
|
*
|
|
* _.range(0, 30, 5);
|
|
* // => [0, 5, 10, 15, 20, 25]
|
|
*
|
|
* _.range(0, -10, -1);
|
|
* // => [0, -1, -2, -3, -4, -5, -6, -7, -8, -9]
|
|
*
|
|
* _.range(0);
|
|
* // => []
|
|
*/
|
|
function range(start, end, step) {
|
|
start = +start || 0;
|
|
step = +step || 1;
|
|
|
|
if (end == null) {
|
|
end = start;
|
|
start = 0;
|
|
}
|
|
// use `Array(length)` so V8 will avoid the slower "dictionary" mode
|
|
// http://youtu.be/XAqIpGU8ZZk#t=17m25s
|
|
var index = -1,
|
|
length = nativeMax(0, ceil((end - start) / step)),
|
|
result = Array(length);
|
|
|
|
while (++index < length) {
|
|
result[index] = start;
|
|
start += step;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* The opposite of `_.initial`, this method gets all but the first value of
|
|
* `array`. If a number `n` is passed, the first `n` values are excluded from
|
|
* the result. If a `callback` function is passed, elements at the beginning
|
|
* of the array are excluded from the result as long as the `callback` returns
|
|
* truthy. The `callback` is bound to `thisArg` and invoked with three
|
|
* arguments; (value, index, array).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias drop, tail
|
|
* @category Arrays
|
|
* @param {Array} array The array to query.
|
|
* @param {Function|Object|Number|String} [callback|n=1] The function called
|
|
* per element or the number of elements to exclude. If a property name or
|
|
* object is passed, it will be used to create a "_.pluck" or "_.where"
|
|
* style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a slice of `array`.
|
|
* @example
|
|
*
|
|
* _.rest([1, 2, 3]);
|
|
* // => [2, 3]
|
|
*
|
|
* _.rest([1, 2, 3], 2);
|
|
* // => [3]
|
|
*
|
|
* _.rest([1, 2, 3], function(num) {
|
|
* return num < 3;
|
|
* });
|
|
* // => [3]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'banana', 'organic': true },
|
|
* { 'name': 'beet', 'organic': false },
|
|
* ];
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.rest(food, 'organic');
|
|
* // => [{ 'name': 'beet', 'organic': false }]
|
|
*
|
|
* var food = [
|
|
* { 'name': 'apple', 'type': 'fruit' },
|
|
* { 'name': 'banana', 'type': 'fruit' },
|
|
* { 'name': 'beet', 'type': 'vegetable' }
|
|
* ];
|
|
*
|
|
* // using "_.where" callback shorthand
|
|
* _.rest(food, { 'type': 'fruit' });
|
|
* // => [{ 'name': 'beet', 'type': 'vegetable' }]
|
|
*/
|
|
function rest(array, callback, thisArg) {
|
|
if (typeof callback != 'number' && callback != null) {
|
|
var n = 0,
|
|
index = -1,
|
|
length = array ? array.length : 0;
|
|
|
|
callback = lodash.createCallback(callback, thisArg);
|
|
while (++index < length && callback(array[index], index, array)) {
|
|
n++;
|
|
}
|
|
} else {
|
|
n = (callback == null || thisArg) ? 1 : nativeMax(0, callback);
|
|
}
|
|
return slice(array, n);
|
|
}
|
|
|
|
/**
|
|
* Uses a binary search to determine the smallest index at which the `value`
|
|
* should be inserted into `array` in order to maintain the sort order of the
|
|
* sorted `array`. If `callback` is passed, it will be executed for `value` and
|
|
* each element in `array` to compute their sort ranking. The `callback` is
|
|
* bound to `thisArg` and invoked with one argument; (value).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to inspect.
|
|
* @param {Mixed} value The value to evaluate.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Number} Returns the index at which the value should be inserted
|
|
* into `array`.
|
|
* @example
|
|
*
|
|
* _.sortedIndex([20, 30, 50], 40);
|
|
* // => 2
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.sortedIndex([{ 'x': 20 }, { 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x');
|
|
* // => 2
|
|
*
|
|
* var dict = {
|
|
* 'wordToNumber': { 'twenty': 20, 'thirty': 30, 'fourty': 40, 'fifty': 50 }
|
|
* };
|
|
*
|
|
* _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) {
|
|
* return dict.wordToNumber[word];
|
|
* });
|
|
* // => 2
|
|
*
|
|
* _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) {
|
|
* return this.wordToNumber[word];
|
|
* }, dict);
|
|
* // => 2
|
|
*/
|
|
function sortedIndex(array, value, callback, thisArg) {
|
|
var low = 0,
|
|
high = array ? array.length : low;
|
|
|
|
// explicitly reference `identity` for better inlining in Firefox
|
|
callback = callback ? lodash.createCallback(callback, thisArg, 1) : identity;
|
|
value = callback(value);
|
|
|
|
while (low < high) {
|
|
var mid = (low + high) >>> 1;
|
|
(callback(array[mid]) < value)
|
|
? low = mid + 1
|
|
: high = mid;
|
|
}
|
|
return low;
|
|
}
|
|
|
|
/**
|
|
* Computes the union of the passed-in arrays using strict equality for
|
|
* comparisons, i.e. `===`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} [array1, array2, ...] Arrays to process.
|
|
* @returns {Array} Returns a new array of unique values, in order, that are
|
|
* present in one or more of the arrays.
|
|
* @example
|
|
*
|
|
* _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]);
|
|
* // => [1, 2, 3, 101, 10]
|
|
*/
|
|
function union(array) {
|
|
if (!isArray(array)) {
|
|
arguments[0] = array ? nativeSlice.call(array) : arrayRef;
|
|
}
|
|
return uniq(concat.apply(arrayRef, arguments));
|
|
}
|
|
|
|
/**
|
|
* Creates a duplicate-value-free version of the `array` using strict equality
|
|
* for comparisons, i.e. `===`. If the `array` is already sorted, passing `true`
|
|
* for `isSorted` will run a faster algorithm. If `callback` is passed, each
|
|
* element of `array` is passed through the `callback` before uniqueness is computed.
|
|
* The `callback` is bound to `thisArg` and invoked with three arguments; (value, index, array).
|
|
*
|
|
* If a property name is passed for `callback`, the created "_.pluck" style
|
|
* callback will return the property value of the given element.
|
|
*
|
|
* If an object is passed for `callback`, the created "_.where" style callback
|
|
* will return `true` for elements that have the properties of the given object,
|
|
* else `false`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias unique
|
|
* @category Arrays
|
|
* @param {Array} array The array to process.
|
|
* @param {Boolean} [isSorted=false] A flag to indicate that the `array` is already sorted.
|
|
* @param {Function|Object|String} [callback=identity] The function called per
|
|
* iteration. If a property name or object is passed, it will be used to create
|
|
* a "_.pluck" or "_.where" style callback, respectively.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a duplicate-value-free array.
|
|
* @example
|
|
*
|
|
* _.uniq([1, 2, 1, 3, 1]);
|
|
* // => [1, 2, 3]
|
|
*
|
|
* _.uniq([1, 1, 2, 2, 3], true);
|
|
* // => [1, 2, 3]
|
|
*
|
|
* _.uniq(['A', 'b', 'C', 'a', 'B', 'c'], function(letter) { return letter.toLowerCase(); });
|
|
* // => ['A', 'b', 'C']
|
|
*
|
|
* _.uniq([1, 2.5, 3, 1.5, 2, 3.5], function(num) { return this.floor(num); }, Math);
|
|
* // => [1, 2.5, 3]
|
|
*
|
|
* // using "_.pluck" callback shorthand
|
|
* _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');
|
|
* // => [{ 'x': 1 }, { 'x': 2 }]
|
|
*/
|
|
var uniq = overloadWrapper(function(array, isSorted, callback) {
|
|
var index = -1,
|
|
indexOf = getIndexOf(),
|
|
length = array ? array.length : 0,
|
|
result = [];
|
|
|
|
var isLarge = !isSorted && length >= largeArraySize && indexOf === basicIndexOf,
|
|
seen = (callback || isLarge) ? getArray() : result;
|
|
|
|
if (isLarge) {
|
|
var cache = createCache(seen);
|
|
if (cache) {
|
|
indexOf = cacheIndexOf;
|
|
seen = cache;
|
|
} else {
|
|
isLarge = false;
|
|
seen = callback ? seen : (releaseArray(seen), result);
|
|
}
|
|
}
|
|
while (++index < length) {
|
|
var value = array[index],
|
|
computed = callback ? callback(value, index, array) : value;
|
|
|
|
if (isSorted
|
|
? !index || seen[seen.length - 1] !== computed
|
|
: indexOf(seen, computed) < 0
|
|
) {
|
|
if (callback || isLarge) {
|
|
seen.push(computed);
|
|
}
|
|
result.push(value);
|
|
}
|
|
}
|
|
if (isLarge) {
|
|
releaseArray(seen.array);
|
|
releaseObject(seen);
|
|
} else if (callback) {
|
|
releaseArray(seen);
|
|
}
|
|
return result;
|
|
});
|
|
|
|
/**
|
|
* The inverse of `_.zip`, this method splits groups of elements into arrays
|
|
* composed of elements from each group at their corresponding indexes.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to process.
|
|
* @returns {Array} Returns a new array of the composed arrays.
|
|
* @example
|
|
*
|
|
* _.unzip([['moe', 30, true], ['larry', 40, false]]);
|
|
* // => [['moe', 'larry'], [30, 40], [true, false]];
|
|
*/
|
|
function unzip(array) {
|
|
var index = -1,
|
|
length = array ? max(pluck(array, 'length')) : 0,
|
|
result = Array(length < 0 ? 0 : length);
|
|
|
|
while (++index < length) {
|
|
result[index] = pluck(array, index);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates an array with all occurrences of the passed values removed using
|
|
* strict equality for comparisons, i.e. `===`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} array The array to filter.
|
|
* @param {Mixed} [value1, value2, ...] Values to remove.
|
|
* @returns {Array} Returns a new filtered array.
|
|
* @example
|
|
*
|
|
* _.without([1, 2, 1, 0, 3, 1, 4], 0, 1);
|
|
* // => [2, 3, 4]
|
|
*/
|
|
function without(array) {
|
|
return difference(array, nativeSlice.call(arguments, 1));
|
|
}
|
|
|
|
/**
|
|
* Groups the elements of each array at their corresponding indexes. Useful for
|
|
* separate data sources that are coordinated through matching array indexes.
|
|
* For a matrix of nested arrays, `_.zip.apply(...)` can transpose the matrix
|
|
* in a similar fashion.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Arrays
|
|
* @param {Array} [array1, array2, ...] Arrays to process.
|
|
* @returns {Array} Returns a new array of grouped elements.
|
|
* @example
|
|
*
|
|
* _.zip(['moe', 'larry'], [30, 40], [true, false]);
|
|
* // => [['moe', 30, true], ['larry', 40, false]]
|
|
*/
|
|
function zip(array) {
|
|
return array ? unzip(arguments) : [];
|
|
}
|
|
|
|
/**
|
|
* Creates an object composed from arrays of `keys` and `values`. Pass either
|
|
* a single two dimensional array, i.e. `[[key1, value1], [key2, value2]]`, or
|
|
* two arrays, one of `keys` and one of corresponding `values`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @alias object
|
|
* @category Arrays
|
|
* @param {Array} keys The array of keys.
|
|
* @param {Array} [values=[]] The array of values.
|
|
* @returns {Object} Returns an object composed of the given keys and
|
|
* corresponding values.
|
|
* @example
|
|
*
|
|
* _.zipObject(['moe', 'larry'], [30, 40]);
|
|
* // => { 'moe': 30, 'larry': 40 }
|
|
*/
|
|
function zipObject(keys, values) {
|
|
var index = -1,
|
|
length = keys ? keys.length : 0,
|
|
result = {};
|
|
|
|
while (++index < length) {
|
|
var key = keys[index];
|
|
if (values) {
|
|
result[key] = values[index];
|
|
} else {
|
|
result[key[0]] = key[1];
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* If `n` is greater than `0`, a function is created that is restricted to
|
|
* executing `func`, with the `this` binding and arguments of the created
|
|
* function, only after it is called `n` times. If `n` is less than `1`,
|
|
* `func` is executed immediately, without a `this` binding or additional
|
|
* arguments, and its result is returned.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Number} n The number of times the function must be called before
|
|
* it is executed.
|
|
* @param {Function} func The function to restrict.
|
|
* @returns {Function} Returns the new restricted function.
|
|
* @example
|
|
*
|
|
* var renderNotes = _.after(notes.length, render);
|
|
* _.forEach(notes, function(note) {
|
|
* note.asyncSave({ 'success': renderNotes });
|
|
* });
|
|
* // `renderNotes` is run once, after all notes have saved
|
|
*/
|
|
function after(n, func) {
|
|
if (n < 1) {
|
|
return func();
|
|
}
|
|
return function() {
|
|
if (--n < 1) {
|
|
return func.apply(this, arguments);
|
|
}
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a function that, when called, invokes `func` with the `this`
|
|
* binding of `thisArg` and prepends any additional `bind` arguments to those
|
|
* passed to the bound function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to bind.
|
|
* @param {Mixed} [thisArg] The `this` binding of `func`.
|
|
* @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.
|
|
* @returns {Function} Returns the new bound function.
|
|
* @example
|
|
*
|
|
* var func = function(greeting) {
|
|
* return greeting + ' ' + this.name;
|
|
* };
|
|
*
|
|
* func = _.bind(func, { 'name': 'moe' }, 'hi');
|
|
* func();
|
|
* // => 'hi moe'
|
|
*/
|
|
function bind(func, thisArg) {
|
|
// use `Function#bind` if it exists and is fast
|
|
// (in V8 `Function#bind` is slower except when partially applied)
|
|
return support.fastBind || (nativeBind && arguments.length > 2)
|
|
? nativeBind.call.apply(nativeBind, arguments)
|
|
: createBound(func, thisArg, nativeSlice.call(arguments, 2));
|
|
}
|
|
|
|
/**
|
|
* Binds methods on `object` to `object`, overwriting the existing method.
|
|
* Method names may be specified as individual arguments or as arrays of method
|
|
* names. If no method names are provided, all the function properties of `object`
|
|
* will be bound.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Object} object The object to bind and assign the bound methods to.
|
|
* @param {String} [methodName1, methodName2, ...] Method names on the object to bind.
|
|
* @returns {Object} Returns `object`.
|
|
* @example
|
|
*
|
|
* var view = {
|
|
* 'label': 'docs',
|
|
* 'onClick': function() { alert('clicked ' + this.label); }
|
|
* };
|
|
*
|
|
* _.bindAll(view);
|
|
* jQuery('#docs').on('click', view.onClick);
|
|
* // => alerts 'clicked docs', when the button is clicked
|
|
*/
|
|
function bindAll(object) {
|
|
var funcs = arguments.length > 1 ? concat.apply(arrayRef, nativeSlice.call(arguments, 1)) : functions(object),
|
|
index = -1,
|
|
length = funcs.length;
|
|
|
|
while (++index < length) {
|
|
var key = funcs[index];
|
|
object[key] = bind(object[key], object);
|
|
}
|
|
return object;
|
|
}
|
|
|
|
/**
|
|
* Creates a function that, when called, invokes the method at `object[key]`
|
|
* and prepends any additional `bindKey` arguments to those passed to the bound
|
|
* function. This method differs from `_.bind` by allowing bound functions to
|
|
* reference methods that will be redefined or don't yet exist.
|
|
* See http://michaux.ca/articles/lazy-function-definition-pattern.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Object} object The object the method belongs to.
|
|
* @param {String} key The key of the method.
|
|
* @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.
|
|
* @returns {Function} Returns the new bound function.
|
|
* @example
|
|
*
|
|
* var object = {
|
|
* 'name': 'moe',
|
|
* 'greet': function(greeting) {
|
|
* return greeting + ' ' + this.name;
|
|
* }
|
|
* };
|
|
*
|
|
* var func = _.bindKey(object, 'greet', 'hi');
|
|
* func();
|
|
* // => 'hi moe'
|
|
*
|
|
* object.greet = function(greeting) {
|
|
* return greeting + ', ' + this.name + '!';
|
|
* };
|
|
*
|
|
* func();
|
|
* // => 'hi, moe!'
|
|
*/
|
|
function bindKey(object, key) {
|
|
return createBound(object, key, nativeSlice.call(arguments, 2), indicatorObject);
|
|
}
|
|
|
|
/**
|
|
* Creates a function that is the composition of the passed functions,
|
|
* where each function consumes the return value of the function that follows.
|
|
* For example, composing the functions `f()`, `g()`, and `h()` produces `f(g(h()))`.
|
|
* Each function is executed with the `this` binding of the composed function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} [func1, func2, ...] Functions to compose.
|
|
* @returns {Function} Returns the new composed function.
|
|
* @example
|
|
*
|
|
* var greet = function(name) { return 'hi ' + name; };
|
|
* var exclaim = function(statement) { return statement + '!'; };
|
|
* var welcome = _.compose(exclaim, greet);
|
|
* welcome('moe');
|
|
* // => 'hi moe!'
|
|
*/
|
|
function compose() {
|
|
var funcs = arguments;
|
|
return function() {
|
|
var args = arguments,
|
|
length = funcs.length;
|
|
|
|
while (length--) {
|
|
args = [funcs[length].apply(this, args)];
|
|
}
|
|
return args[0];
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Produces a callback bound to an optional `thisArg`. If `func` is a property
|
|
* name, the created callback will return the property value for a given element.
|
|
* If `func` is an object, the created callback will return `true` for elements
|
|
* that contain the equivalent object properties, otherwise it will return `false`.
|
|
*
|
|
* Note: All Lo-Dash methods, that accept a `callback` argument, use `_.createCallback`.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Mixed} [func=identity] The value to convert to a callback.
|
|
* @param {Mixed} [thisArg] The `this` binding of the created callback.
|
|
* @param {Number} [argCount=3] The number of arguments the callback accepts.
|
|
* @returns {Function} Returns a callback function.
|
|
* @example
|
|
*
|
|
* var stooges = [
|
|
* { 'name': 'moe', 'age': 40 },
|
|
* { 'name': 'larry', 'age': 50 }
|
|
* ];
|
|
*
|
|
* // wrap to create custom callback shorthands
|
|
* _.createCallback = _.wrap(_.createCallback, function(func, callback, thisArg) {
|
|
* var match = /^(.+?)__([gl]t)(.+)$/.exec(callback);
|
|
* return !match ? func(callback, thisArg) : function(object) {
|
|
* return match[2] == 'gt' ? object[match[1]] > match[3] : object[match[1]] < match[3];
|
|
* };
|
|
* });
|
|
*
|
|
* _.filter(stooges, 'age__gt45');
|
|
* // => [{ 'name': 'larry', 'age': 50 }]
|
|
*
|
|
* // create mixins with support for "_.pluck" and "_.where" callback shorthands
|
|
* _.mixin({
|
|
* 'toLookup': function(collection, callback, thisArg) {
|
|
* callback = _.createCallback(callback, thisArg);
|
|
* return _.reduce(collection, function(result, value, index, collection) {
|
|
* return (result[callback(value, index, collection)] = value, result);
|
|
* }, {});
|
|
* }
|
|
* });
|
|
*
|
|
* _.toLookup(stooges, 'name');
|
|
* // => { 'moe': { 'name': 'moe', 'age': 40 }, 'larry': { 'name': 'larry', 'age': 50 } }
|
|
*/
|
|
function createCallback(func, thisArg, argCount) {
|
|
if (func == null) {
|
|
return identity;
|
|
}
|
|
var type = typeof func;
|
|
if (type != 'function') {
|
|
if (type != 'object') {
|
|
return function(object) {
|
|
return object[func];
|
|
};
|
|
}
|
|
var props = keys(func);
|
|
return function(object) {
|
|
var length = props.length,
|
|
result = false;
|
|
while (length--) {
|
|
if (!(result = isEqual(object[props[length]], func[props[length]], indicatorObject))) {
|
|
break;
|
|
}
|
|
}
|
|
return result;
|
|
};
|
|
}
|
|
if (typeof thisArg == 'undefined' || (reThis && !reThis.test(fnToString.call(func)))) {
|
|
return func;
|
|
}
|
|
if (argCount === 1) {
|
|
return function(value) {
|
|
return func.call(thisArg, value);
|
|
};
|
|
}
|
|
if (argCount === 2) {
|
|
return function(a, b) {
|
|
return func.call(thisArg, a, b);
|
|
};
|
|
}
|
|
if (argCount === 4) {
|
|
return function(accumulator, value, index, collection) {
|
|
return func.call(thisArg, accumulator, value, index, collection);
|
|
};
|
|
}
|
|
return function(value, index, collection) {
|
|
return func.call(thisArg, value, index, collection);
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a function that will delay the execution of `func` until after
|
|
* `wait` milliseconds have elapsed since the last time it was invoked. Pass
|
|
* an `options` object to indicate that `func` should be invoked on the leading
|
|
* and/or trailing edge of the `wait` timeout. Subsequent calls to the debounced
|
|
* function will return the result of the last `func` call.
|
|
*
|
|
* Note: If `leading` and `trailing` options are `true`, `func` will be called
|
|
* on the trailing edge of the timeout only if the the debounced function is
|
|
* invoked more than once during the `wait` timeout.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to debounce.
|
|
* @param {Number} wait The number of milliseconds to delay.
|
|
* @param {Object} options The options object.
|
|
* [leading=false] A boolean to specify execution on the leading edge of the timeout.
|
|
* [maxWait] The maximum time `func` is allowed to be delayed before it's called.
|
|
* [trailing=true] A boolean to specify execution on the trailing edge of the timeout.
|
|
* @returns {Function} Returns the new debounced function.
|
|
* @example
|
|
*
|
|
* var lazyLayout = _.debounce(calculateLayout, 300);
|
|
* jQuery(window).on('resize', lazyLayout);
|
|
*
|
|
* jQuery('#postbox').on('click', _.debounce(sendMail, 200, {
|
|
* 'leading': true,
|
|
* 'trailing': false
|
|
* });
|
|
*/
|
|
function debounce(func, wait, options) {
|
|
var args,
|
|
result,
|
|
thisArg,
|
|
callCount = 0,
|
|
lastCalled = 0,
|
|
maxWait = false,
|
|
maxTimeoutId = null,
|
|
timeoutId = null,
|
|
trailing = true;
|
|
|
|
function clear() {
|
|
clearTimeout(maxTimeoutId);
|
|
clearTimeout(timeoutId);
|
|
callCount = 0;
|
|
maxTimeoutId = timeoutId = null;
|
|
}
|
|
|
|
function delayed() {
|
|
var isCalled = trailing && (!leading || callCount > 1);
|
|
clear();
|
|
if (isCalled) {
|
|
if (maxWait !== false) {
|
|
lastCalled = new Date;
|
|
}
|
|
result = func.apply(thisArg, args);
|
|
}
|
|
}
|
|
|
|
function maxDelayed() {
|
|
clear();
|
|
if (trailing || (maxWait !== wait)) {
|
|
lastCalled = new Date;
|
|
result = func.apply(thisArg, args);
|
|
}
|
|
}
|
|
|
|
wait = nativeMax(0, wait || 0);
|
|
if (options === true) {
|
|
var leading = true;
|
|
trailing = false;
|
|
} else if (isObject(options)) {
|
|
leading = options.leading;
|
|
maxWait = 'maxWait' in options && nativeMax(wait, options.maxWait || 0);
|
|
trailing = 'trailing' in options ? options.trailing : trailing;
|
|
}
|
|
return function() {
|
|
args = arguments;
|
|
thisArg = this;
|
|
callCount++;
|
|
|
|
// avoid issues with Titanium and `undefined` timeout ids
|
|
// https://github.com/appcelerator/titanium_mobile/blob/3_1_0_GA/android/titanium/src/java/ti/modules/titanium/TitaniumModule.java#L185-L192
|
|
clearTimeout(timeoutId);
|
|
|
|
if (maxWait === false) {
|
|
if (leading && callCount < 2) {
|
|
result = func.apply(thisArg, args);
|
|
}
|
|
} else {
|
|
var now = new Date;
|
|
if (!maxTimeoutId && !leading) {
|
|
lastCalled = now;
|
|
}
|
|
var remaining = maxWait - (now - lastCalled);
|
|
if (remaining <= 0) {
|
|
clearTimeout(maxTimeoutId);
|
|
maxTimeoutId = null;
|
|
lastCalled = now;
|
|
result = func.apply(thisArg, args);
|
|
}
|
|
else if (!maxTimeoutId) {
|
|
maxTimeoutId = setTimeout(maxDelayed, remaining);
|
|
}
|
|
}
|
|
if (wait !== maxWait) {
|
|
timeoutId = setTimeout(delayed, wait);
|
|
}
|
|
return result;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Defers executing the `func` function until the current call stack has cleared.
|
|
* Additional arguments will be passed to `func` when it is invoked.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to defer.
|
|
* @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with.
|
|
* @returns {Number} Returns the timer id.
|
|
* @example
|
|
*
|
|
* _.defer(function() { alert('deferred'); });
|
|
* // returns from the function before `alert` is called
|
|
*/
|
|
function defer(func) {
|
|
var args = nativeSlice.call(arguments, 1);
|
|
return setTimeout(function() { func.apply(undefined, args); }, 1);
|
|
}
|
|
// use `setImmediate` if it's available in Node.js
|
|
if (isV8 && freeModule && typeof setImmediate == 'function') {
|
|
defer = bind(setImmediate, context);
|
|
}
|
|
|
|
/**
|
|
* Executes the `func` function after `wait` milliseconds. Additional arguments
|
|
* will be passed to `func` when it is invoked.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to delay.
|
|
* @param {Number} wait The number of milliseconds to delay execution.
|
|
* @param {Mixed} [arg1, arg2, ...] Arguments to invoke the function with.
|
|
* @returns {Number} Returns the timer id.
|
|
* @example
|
|
*
|
|
* var log = _.bind(console.log, console);
|
|
* _.delay(log, 1000, 'logged later');
|
|
* // => 'logged later' (Appears after one second.)
|
|
*/
|
|
function delay(func, wait) {
|
|
var args = nativeSlice.call(arguments, 2);
|
|
return setTimeout(function() { func.apply(undefined, args); }, wait);
|
|
}
|
|
|
|
/**
|
|
* Creates a function that memoizes the result of `func`. If `resolver` is
|
|
* passed, it will be used to determine the cache key for storing the result
|
|
* based on the arguments passed to the memoized function. By default, the first
|
|
* argument passed to the memoized function is used as the cache key. The `func`
|
|
* is executed with the `this` binding of the memoized function. The result
|
|
* cache is exposed as the `cache` property on the memoized function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to have its output memoized.
|
|
* @param {Function} [resolver] A function used to resolve the cache key.
|
|
* @returns {Function} Returns the new memoizing function.
|
|
* @example
|
|
*
|
|
* var fibonacci = _.memoize(function(n) {
|
|
* return n < 2 ? n : fibonacci(n - 1) + fibonacci(n - 2);
|
|
* });
|
|
*/
|
|
function memoize(func, resolver) {
|
|
function memoized() {
|
|
var cache = memoized.cache,
|
|
key = keyPrefix + (resolver ? resolver.apply(this, arguments) : arguments[0]);
|
|
|
|
return hasOwnProperty.call(cache, key)
|
|
? cache[key]
|
|
: (cache[key] = func.apply(this, arguments));
|
|
}
|
|
memoized.cache = {};
|
|
return memoized;
|
|
}
|
|
|
|
/**
|
|
* Creates a function that is restricted to execute `func` once. Repeat calls to
|
|
* the function will return the value of the first call. The `func` is executed
|
|
* with the `this` binding of the created function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to restrict.
|
|
* @returns {Function} Returns the new restricted function.
|
|
* @example
|
|
*
|
|
* var initialize = _.once(createApplication);
|
|
* initialize();
|
|
* initialize();
|
|
* // `initialize` executes `createApplication` once
|
|
*/
|
|
function once(func) {
|
|
var ran,
|
|
result;
|
|
|
|
return function() {
|
|
if (ran) {
|
|
return result;
|
|
}
|
|
ran = true;
|
|
result = func.apply(this, arguments);
|
|
|
|
// clear the `func` variable so the function may be garbage collected
|
|
func = null;
|
|
return result;
|
|
};
|
|
}
|
|
|
|
/**
|
|
* Creates a function that, when called, invokes `func` with any additional
|
|
* `partial` arguments prepended to those passed to the new function. This
|
|
* method is similar to `_.bind`, except it does **not** alter the `this` binding.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to partially apply arguments to.
|
|
* @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.
|
|
* @returns {Function} Returns the new partially applied function.
|
|
* @example
|
|
*
|
|
* var greet = function(greeting, name) { return greeting + ' ' + name; };
|
|
* var hi = _.partial(greet, 'hi');
|
|
* hi('moe');
|
|
* // => 'hi moe'
|
|
*/
|
|
function partial(func) {
|
|
return createBound(func, nativeSlice.call(arguments, 1));
|
|
}
|
|
|
|
/**
|
|
* This method is similar to `_.partial`, except that `partial` arguments are
|
|
* appended to those passed to the new function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to partially apply arguments to.
|
|
* @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied.
|
|
* @returns {Function} Returns the new partially applied function.
|
|
* @example
|
|
*
|
|
* var defaultsDeep = _.partialRight(_.merge, _.defaults);
|
|
*
|
|
* var options = {
|
|
* 'variable': 'data',
|
|
* 'imports': { 'jq': $ }
|
|
* };
|
|
*
|
|
* defaultsDeep(options, _.templateSettings);
|
|
*
|
|
* options.variable
|
|
* // => 'data'
|
|
*
|
|
* options.imports
|
|
* // => { '_': _, 'jq': $ }
|
|
*/
|
|
function partialRight(func) {
|
|
return createBound(func, nativeSlice.call(arguments, 1), null, indicatorObject);
|
|
}
|
|
|
|
/**
|
|
* Creates a function that, when executed, will only call the `func` function
|
|
* at most once per every `wait` milliseconds. Pass an `options` object to
|
|
* indicate that `func` should be invoked on the leading and/or trailing edge
|
|
* of the `wait` timeout. Subsequent calls to the throttled function will
|
|
* return the result of the last `func` call.
|
|
*
|
|
* Note: If `leading` and `trailing` options are `true`, `func` will be called
|
|
* on the trailing edge of the timeout only if the the throttled function is
|
|
* invoked more than once during the `wait` timeout.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Function} func The function to throttle.
|
|
* @param {Number} wait The number of milliseconds to throttle executions to.
|
|
* @param {Object} options The options object.
|
|
* [leading=true] A boolean to specify execution on the leading edge of the timeout.
|
|
* [trailing=true] A boolean to specify execution on the trailing edge of the timeout.
|
|
* @returns {Function} Returns the new throttled function.
|
|
* @example
|
|
*
|
|
* var throttled = _.throttle(updatePosition, 100);
|
|
* jQuery(window).on('scroll', throttled);
|
|
*
|
|
* jQuery('.interactive').on('click', _.throttle(renewToken, 300000, {
|
|
* 'trailing': false
|
|
* }));
|
|
*/
|
|
function throttle(func, wait, options) {
|
|
var leading = true,
|
|
trailing = true;
|
|
|
|
if (options === false) {
|
|
leading = false;
|
|
} else if (isObject(options)) {
|
|
leading = 'leading' in options ? options.leading : leading;
|
|
trailing = 'trailing' in options ? options.trailing : trailing;
|
|
}
|
|
options = getObject();
|
|
options.leading = leading;
|
|
options.maxWait = wait;
|
|
options.trailing = trailing;
|
|
|
|
var result = debounce(func, wait, options);
|
|
releaseObject(options);
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates a function that passes `value` to the `wrapper` function as its
|
|
* first argument. Additional arguments passed to the function are appended
|
|
* to those passed to the `wrapper` function. The `wrapper` is executed with
|
|
* the `this` binding of the created function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Functions
|
|
* @param {Mixed} value The value to wrap.
|
|
* @param {Function} wrapper The wrapper function.
|
|
* @returns {Function} Returns the new function.
|
|
* @example
|
|
*
|
|
* var hello = function(name) { return 'hello ' + name; };
|
|
* hello = _.wrap(hello, function(func) {
|
|
* return 'before, ' + func('moe') + ', after';
|
|
* });
|
|
* hello();
|
|
* // => 'before, hello moe, after'
|
|
*/
|
|
function wrap(value, wrapper) {
|
|
return function() {
|
|
var args = [value];
|
|
push.apply(args, arguments);
|
|
return wrapper.apply(this, args);
|
|
};
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Converts the characters `&`, `<`, `>`, `"`, and `'` in `string` to their
|
|
* corresponding HTML entities.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {String} string The string to escape.
|
|
* @returns {String} Returns the escaped string.
|
|
* @example
|
|
*
|
|
* _.escape('Moe, Larry & Curly');
|
|
* // => 'Moe, Larry & Curly'
|
|
*/
|
|
function escape(string) {
|
|
return string == null ? '' : String(string).replace(reUnescapedHtml, escapeHtmlChar);
|
|
}
|
|
|
|
/**
|
|
* This method returns the first argument passed to it.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {Mixed} value Any value.
|
|
* @returns {Mixed} Returns `value`.
|
|
* @example
|
|
*
|
|
* var moe = { 'name': 'moe' };
|
|
* moe === _.identity(moe);
|
|
* // => true
|
|
*/
|
|
function identity(value) {
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* Adds functions properties of `object` to the `lodash` function and chainable
|
|
* wrapper.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {Object} object The object of function properties to add to `lodash`.
|
|
* @example
|
|
*
|
|
* _.mixin({
|
|
* 'capitalize': function(string) {
|
|
* return string.charAt(0).toUpperCase() + string.slice(1).toLowerCase();
|
|
* }
|
|
* });
|
|
*
|
|
* _.capitalize('moe');
|
|
* // => 'Moe'
|
|
*
|
|
* _('moe').capitalize();
|
|
* // => 'Moe'
|
|
*/
|
|
function mixin(object) {
|
|
forEach(functions(object), function(methodName) {
|
|
var func = lodash[methodName] = object[methodName];
|
|
|
|
lodash.prototype[methodName] = function() {
|
|
var value = this.__wrapped__,
|
|
args = [value];
|
|
|
|
push.apply(args, arguments);
|
|
var result = func.apply(lodash, args);
|
|
return (value && typeof value == 'object' && value === result)
|
|
? this
|
|
: new lodashWrapper(result);
|
|
};
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Reverts the '_' variable to its previous value and returns a reference to
|
|
* the `lodash` function.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @returns {Function} Returns the `lodash` function.
|
|
* @example
|
|
*
|
|
* var lodash = _.noConflict();
|
|
*/
|
|
function noConflict() {
|
|
context._ = oldDash;
|
|
return this;
|
|
}
|
|
|
|
/**
|
|
* Converts the given `value` into an integer of the specified `radix`.
|
|
* If `radix` is `undefined` or `0`, a `radix` of `10` is used unless the
|
|
* `value` is a hexadecimal, in which case a `radix` of `16` is used.
|
|
*
|
|
* Note: This method avoids differences in native ES3 and ES5 `parseInt`
|
|
* implementations. See http://es5.github.com/#E.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {String} value The value to parse.
|
|
* @param {Number} [radix] The radix used to interpret the value to parse.
|
|
* @returns {Number} Returns the new integer value.
|
|
* @example
|
|
*
|
|
* _.parseInt('08');
|
|
* // => 8
|
|
*/
|
|
var parseInt = nativeParseInt(whitespace + '08') == 8 ? nativeParseInt : function(value, radix) {
|
|
// Firefox and Opera still follow the ES3 specified implementation of `parseInt`
|
|
return nativeParseInt(isString(value) ? value.replace(reLeadingSpacesAndZeros, '') : value, radix || 0);
|
|
};
|
|
|
|
/**
|
|
* Produces a random number between `min` and `max` (inclusive). If only one
|
|
* argument is passed, a number between `0` and the given number will be returned.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {Number} [min=0] The minimum possible value.
|
|
* @param {Number} [max=1] The maximum possible value.
|
|
* @returns {Number} Returns a random number.
|
|
* @example
|
|
*
|
|
* _.random(0, 5);
|
|
* // => a number between 0 and 5
|
|
*
|
|
* _.random(5);
|
|
* // => also a number between 0 and 5
|
|
*/
|
|
function random(min, max) {
|
|
if (min == null && max == null) {
|
|
max = 1;
|
|
}
|
|
min = +min || 0;
|
|
if (max == null) {
|
|
max = min;
|
|
min = 0;
|
|
} else {
|
|
max = +max || 0;
|
|
}
|
|
var rand = nativeRandom();
|
|
return (min % 1 || max % 1)
|
|
? min + nativeMin(rand * (max - min + parseFloat('1e-' + ((rand +'').length - 1))), max)
|
|
: min + floor(rand * (max - min + 1));
|
|
}
|
|
|
|
/**
|
|
* Resolves the value of `property` on `object`. If `property` is a function,
|
|
* it will be invoked with the `this` binding of `object` and its result returned,
|
|
* else the property value is returned. If `object` is falsey, then `undefined`
|
|
* is returned.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {Object} object The object to inspect.
|
|
* @param {String} property The property to get the value of.
|
|
* @returns {Mixed} Returns the resolved value.
|
|
* @example
|
|
*
|
|
* var object = {
|
|
* 'cheese': 'crumpets',
|
|
* 'stuff': function() {
|
|
* return 'nonsense';
|
|
* }
|
|
* };
|
|
*
|
|
* _.result(object, 'cheese');
|
|
* // => 'crumpets'
|
|
*
|
|
* _.result(object, 'stuff');
|
|
* // => 'nonsense'
|
|
*/
|
|
function result(object, property) {
|
|
var value = object ? object[property] : undefined;
|
|
return isFunction(value) ? object[property]() : value;
|
|
}
|
|
|
|
/**
|
|
* Executes the `callback` function `n` times, returning an array of the results
|
|
* of each `callback` execution. The `callback` is bound to `thisArg` and invoked
|
|
* with one argument; (index).
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {Number} n The number of times to execute the callback.
|
|
* @param {Function} callback The function called per iteration.
|
|
* @param {Mixed} [thisArg] The `this` binding of `callback`.
|
|
* @returns {Array} Returns a new array of the results of each `callback` execution.
|
|
* @example
|
|
*
|
|
* var diceRolls = _.times(3, _.partial(_.random, 1, 6));
|
|
* // => [3, 6, 4]
|
|
*
|
|
* _.times(3, function(n) { mage.castSpell(n); });
|
|
* // => calls `mage.castSpell(n)` three times, passing `n` of `0`, `1`, and `2` respectively
|
|
*
|
|
* _.times(3, function(n) { this.cast(n); }, mage);
|
|
* // => also calls `mage.castSpell(n)` three times
|
|
*/
|
|
function times(n, callback, thisArg) {
|
|
n = (n = +n) > -1 ? n : 0;
|
|
var index = -1,
|
|
result = Array(n);
|
|
|
|
callback = lodash.createCallback(callback, thisArg, 1);
|
|
while (++index < n) {
|
|
result[index] = callback(index);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* The inverse of `_.escape`, this method converts the HTML entities
|
|
* `&`, `<`, `>`, `"`, and `'` in `string` to their
|
|
* corresponding characters.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {String} string The string to unescape.
|
|
* @returns {String} Returns the unescaped string.
|
|
* @example
|
|
*
|
|
* _.unescape('Moe, Larry & Curly');
|
|
* // => 'Moe, Larry & Curly'
|
|
*/
|
|
function unescape(string) {
|
|
return string == null ? '' : String(string).replace(reEscapedHtml, unescapeHtmlChar);
|
|
}
|
|
|
|
/**
|
|
* Generates a unique ID. If `prefix` is passed, the ID will be appended to it.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Utilities
|
|
* @param {String} [prefix] The value to prefix the ID with.
|
|
* @returns {String} Returns the unique ID.
|
|
* @example
|
|
*
|
|
* _.uniqueId('contact_');
|
|
* // => 'contact_104'
|
|
*
|
|
* _.uniqueId();
|
|
* // => '105'
|
|
*/
|
|
function uniqueId(prefix) {
|
|
var id = ++idCounter;
|
|
return String(prefix == null ? '' : prefix) + id;
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* Invokes `interceptor` with the `value` as the first argument, and then
|
|
* returns `value`. The purpose of this method is to "tap into" a method chain,
|
|
* in order to perform operations on intermediate results within the chain.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @category Chaining
|
|
* @param {Mixed} value The value to pass to `interceptor`.
|
|
* @param {Function} interceptor The function to invoke.
|
|
* @returns {Mixed} Returns `value`.
|
|
* @example
|
|
*
|
|
* _([1, 2, 3, 4])
|
|
* .filter(function(num) { return num % 2 == 0; })
|
|
* .tap(alert)
|
|
* .map(function(num) { return num * num; })
|
|
* .value();
|
|
* // => // [2, 4] (alerted)
|
|
* // => [4, 16]
|
|
*/
|
|
function tap(value, interceptor) {
|
|
interceptor(value);
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* Produces the `toString` result of the wrapped value.
|
|
*
|
|
* @name toString
|
|
* @memberOf _
|
|
* @category Chaining
|
|
* @returns {String} Returns the string result.
|
|
* @example
|
|
*
|
|
* _([1, 2, 3]).toString();
|
|
* // => '1,2,3'
|
|
*/
|
|
function wrapperToString() {
|
|
return String(this.__wrapped__);
|
|
}
|
|
|
|
/**
|
|
* Extracts the wrapped value.
|
|
*
|
|
* @name valueOf
|
|
* @memberOf _
|
|
* @alias value
|
|
* @category Chaining
|
|
* @returns {Mixed} Returns the wrapped value.
|
|
* @example
|
|
*
|
|
* _([1, 2, 3]).valueOf();
|
|
* // => [1, 2, 3]
|
|
*/
|
|
function wrapperValueOf() {
|
|
return this.__wrapped__;
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
// add functions that return wrapped values when chaining
|
|
lodash.after = after;
|
|
lodash.assign = assign;
|
|
lodash.at = at;
|
|
lodash.bind = bind;
|
|
lodash.bindAll = bindAll;
|
|
lodash.bindKey = bindKey;
|
|
lodash.compact = compact;
|
|
lodash.compose = compose;
|
|
lodash.countBy = countBy;
|
|
lodash.createCallback = createCallback;
|
|
lodash.debounce = debounce;
|
|
lodash.defaults = defaults;
|
|
lodash.defer = defer;
|
|
lodash.delay = delay;
|
|
lodash.difference = difference;
|
|
lodash.filter = filter;
|
|
lodash.flatten = flatten;
|
|
lodash.forEach = forEach;
|
|
lodash.forIn = forIn;
|
|
lodash.forOwn = forOwn;
|
|
lodash.functions = functions;
|
|
lodash.groupBy = groupBy;
|
|
lodash.initial = initial;
|
|
lodash.intersection = intersection;
|
|
lodash.invert = invert;
|
|
lodash.invoke = invoke;
|
|
lodash.keys = keys;
|
|
lodash.map = map;
|
|
lodash.max = max;
|
|
lodash.memoize = memoize;
|
|
lodash.merge = merge;
|
|
lodash.min = min;
|
|
lodash.omit = omit;
|
|
lodash.once = once;
|
|
lodash.pairs = pairs;
|
|
lodash.partial = partial;
|
|
lodash.partialRight = partialRight;
|
|
lodash.pick = pick;
|
|
lodash.pluck = pluck;
|
|
lodash.range = range;
|
|
lodash.reject = reject;
|
|
lodash.rest = rest;
|
|
lodash.shuffle = shuffle;
|
|
lodash.sortBy = sortBy;
|
|
lodash.tap = tap;
|
|
lodash.throttle = throttle;
|
|
lodash.times = times;
|
|
lodash.toArray = toArray;
|
|
lodash.transform = transform;
|
|
lodash.union = union;
|
|
lodash.uniq = uniq;
|
|
lodash.unzip = unzip;
|
|
lodash.values = values;
|
|
lodash.where = where;
|
|
lodash.without = without;
|
|
lodash.wrap = wrap;
|
|
lodash.zip = zip;
|
|
lodash.zipObject = zipObject;
|
|
|
|
// add aliases
|
|
lodash.collect = map;
|
|
lodash.drop = rest;
|
|
lodash.each = forEach;
|
|
lodash.extend = assign;
|
|
lodash.methods = functions;
|
|
lodash.object = zipObject;
|
|
lodash.select = filter;
|
|
lodash.tail = rest;
|
|
lodash.unique = uniq;
|
|
|
|
// add functions to `lodash.prototype`
|
|
mixin(lodash);
|
|
|
|
// add Underscore compat
|
|
lodash.chain = lodash;
|
|
lodash.prototype.chain = function() { return this; };
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
// add functions that return unwrapped values when chaining
|
|
lodash.clone = clone;
|
|
lodash.cloneDeep = cloneDeep;
|
|
lodash.contains = contains;
|
|
lodash.escape = escape;
|
|
lodash.every = every;
|
|
lodash.find = find;
|
|
lodash.findIndex = findIndex;
|
|
lodash.findKey = findKey;
|
|
lodash.has = has;
|
|
lodash.identity = identity;
|
|
lodash.indexOf = indexOf;
|
|
lodash.isArguments = isArguments;
|
|
lodash.isArray = isArray;
|
|
lodash.isBoolean = isBoolean;
|
|
lodash.isDate = isDate;
|
|
lodash.isElement = isElement;
|
|
lodash.isEmpty = isEmpty;
|
|
lodash.isEqual = isEqual;
|
|
lodash.isFinite = isFinite;
|
|
lodash.isFunction = isFunction;
|
|
lodash.isNaN = isNaN;
|
|
lodash.isNull = isNull;
|
|
lodash.isNumber = isNumber;
|
|
lodash.isObject = isObject;
|
|
lodash.isPlainObject = isPlainObject;
|
|
lodash.isRegExp = isRegExp;
|
|
lodash.isString = isString;
|
|
lodash.isUndefined = isUndefined;
|
|
lodash.lastIndexOf = lastIndexOf;
|
|
lodash.mixin = mixin;
|
|
lodash.noConflict = noConflict;
|
|
lodash.parseInt = parseInt;
|
|
lodash.random = random;
|
|
lodash.reduce = reduce;
|
|
lodash.reduceRight = reduceRight;
|
|
lodash.result = result;
|
|
lodash.runInContext = runInContext;
|
|
lodash.size = size;
|
|
lodash.some = some;
|
|
lodash.sortedIndex = sortedIndex;
|
|
lodash.unescape = unescape;
|
|
lodash.uniqueId = uniqueId;
|
|
|
|
// add aliases
|
|
lodash.all = every;
|
|
lodash.any = some;
|
|
lodash.detect = find;
|
|
lodash.findWhere = find;
|
|
lodash.foldl = reduce;
|
|
lodash.foldr = reduceRight;
|
|
lodash.include = contains;
|
|
lodash.inject = reduce;
|
|
|
|
forOwn(lodash, function(func, methodName) {
|
|
if (!lodash.prototype[methodName]) {
|
|
lodash.prototype[methodName] = function() {
|
|
var args = [this.__wrapped__];
|
|
push.apply(args, arguments);
|
|
return func.apply(lodash, args);
|
|
};
|
|
}
|
|
});
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
// add functions capable of returning wrapped and unwrapped values when chaining
|
|
lodash.first = first;
|
|
lodash.last = last;
|
|
|
|
// add aliases
|
|
lodash.take = first;
|
|
lodash.head = first;
|
|
|
|
forOwn(lodash, function(func, methodName) {
|
|
if (!lodash.prototype[methodName]) {
|
|
lodash.prototype[methodName]= function(callback, thisArg) {
|
|
var result = func(this.__wrapped__, callback, thisArg);
|
|
return callback == null || (thisArg && typeof callback != 'function')
|
|
? result
|
|
: new lodashWrapper(result);
|
|
};
|
|
}
|
|
});
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* The semantic version number.
|
|
*
|
|
* @static
|
|
* @memberOf _
|
|
* @type String
|
|
*/
|
|
lodash.VERSION = '1.3.0';
|
|
|
|
// add "Chaining" functions to the wrapper
|
|
lodash.prototype.toString = wrapperToString;
|
|
lodash.prototype.value = wrapperValueOf;
|
|
lodash.prototype.valueOf = wrapperValueOf;
|
|
|
|
// add `Array` functions that return unwrapped values
|
|
basicEach(['join', 'pop', 'shift'], function(methodName) {
|
|
var func = arrayRef[methodName];
|
|
lodash.prototype[methodName] = function() {
|
|
return func.apply(this.__wrapped__, arguments);
|
|
};
|
|
});
|
|
|
|
// add `Array` functions that return the wrapped value
|
|
basicEach(['push', 'reverse', 'sort', 'unshift'], function(methodName) {
|
|
var func = arrayRef[methodName];
|
|
lodash.prototype[methodName] = function() {
|
|
func.apply(this.__wrapped__, arguments);
|
|
return this;
|
|
};
|
|
});
|
|
|
|
// add `Array` functions that return new wrapped values
|
|
basicEach(['concat', 'slice', 'splice'], function(methodName) {
|
|
var func = arrayRef[methodName];
|
|
lodash.prototype[methodName] = function() {
|
|
return new lodashWrapper(func.apply(this.__wrapped__, arguments));
|
|
};
|
|
});
|
|
|
|
// avoid array-like object bugs with `Array#shift` and `Array#splice`
|
|
// in Firefox < 10 and IE < 9
|
|
if (!support.spliceObjects) {
|
|
basicEach(['pop', 'shift', 'splice'], function(methodName) {
|
|
var func = arrayRef[methodName],
|
|
isSplice = methodName == 'splice';
|
|
|
|
lodash.prototype[methodName] = function() {
|
|
var value = this.__wrapped__,
|
|
result = func.apply(value, arguments);
|
|
|
|
if (value.length === 0) {
|
|
delete value[0];
|
|
}
|
|
return isSplice ? new lodashWrapper(result) : result;
|
|
};
|
|
});
|
|
}
|
|
|
|
return lodash;
|
|
}
|
|
|
|
/*--------------------------------------------------------------------------*/
|
|
|
|
// expose Lo-Dash
|
|
var _ = runInContext();
|
|
|
|
// some AMD build optimizers, like r.js, check for specific condition patterns like the following:
|
|
if (typeof define == 'function' && typeof define.amd == 'object' && define.amd) {
|
|
// Expose Lo-Dash to the global object even when an AMD loader is present in
|
|
// case Lo-Dash was injected by a third-party script and not intended to be
|
|
// loaded as a module. The global assignment can be reverted in the Lo-Dash
|
|
// module via its `noConflict()` method.
|
|
window._ = _;
|
|
|
|
// define as an anonymous module so, through path mapping, it can be
|
|
// referenced as the "underscore" module
|
|
define(function() {
|
|
return _;
|
|
});
|
|
}
|
|
// check for `exports` after `define` in case a build optimizer adds an `exports` object
|
|
else if (freeExports && !freeExports.nodeType) {
|
|
// in Node.js or RingoJS v0.8.0+
|
|
if (freeModule) {
|
|
(freeModule.exports = _)._ = _;
|
|
}
|
|
// in Narwhal or RingoJS v0.7.0-
|
|
else {
|
|
freeExports._ = _;
|
|
}
|
|
}
|
|
else {
|
|
// in a browser or Rhino
|
|
window._ = _;
|
|
}
|
|
}(this));
|