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23 lines
581 B
JavaScript
23 lines
581 B
JavaScript
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export default function computed() {
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var args = [].slice.apply(arguments);
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var keys = args.slice(0, -1);
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var compute = args.slice(-1)[0];
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var values = {};
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var computed;
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return function() {
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var recompute = false;
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keys.forEach(function(key) {
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var value = typeof this[key] === 'function' ? this[key]() : this[key];
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if (values[key] !== value) {
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recompute = true;
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values[key] = value;
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}
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}.bind(this));
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if (recompute) {
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computed = compute.apply(this, keys.map((key) => values[key]));
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}
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return computed;
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}
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};
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