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66 lines
2.2 KiB
JavaScript
66 lines
2.2 KiB
JavaScript
/**
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* Extend an object's method by running its output through a mutating callback
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* every time it is called.
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*
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* The callback accepts the method's return value and should perform any
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* mutations directly on this value. For this reason, this function will not be
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* effective on methods which return scalar values (numbers, strings, booleans).
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*
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* Care should be taken to extend the correct object – in most cases, a class'
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* prototype will be the desired target of extension, not the class itself.
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*
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* @example
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* extend(Discussion.prototype, 'badges', function(badges) {
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* // do something with `badges`
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* });
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*
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* @param {Object} object The object that owns the method
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* @param {String} method The name of the method to extend
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* @param {function} callback A callback which mutates the method's output
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*/
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export function extend(object, method, callback) {
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const original = object[method];
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object[method] = function(...args) {
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const value = original ? original.apply(this, args) : undefined;
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callback.apply(this, [value].concat(args));
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return value;
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};
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Object.assign(object[method], original);
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}
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/**
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* Override an object's method by replacing it with a new function, so that the
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* new function will be run every time the object's method is called.
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*
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* The replacement function accepts the original method as its first argument,
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* which is like a call to 'super'. Any arguments passed to the original method
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* are also passed to the replacement.
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*
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* Care should be taken to extend the correct object – in most cases, a class'
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* prototype will be the desired target of extension, not the class itself.
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*
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* @example
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* override(Discussion.prototype, 'badges', function(original) {
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* const badges = original();
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* // do something with badges
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* return badges;
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* });
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*
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* @param {Object} object The object that owns the method
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* @param {String} method The name of the method to override
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* @param {function} newMethod The method to replace it with
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*/
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export function override(object, method, newMethod) {
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const original = object[method];
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object[method] = function(...args) {
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return newMethod.apply(this, [original.bind(this)].concat(args));
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};
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Object.assign(object[method], original);
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}
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