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20 lines
605 B
20 lines
605 B
1 year ago
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'use strict';
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var $ = require('../internals/export');
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var call = require('../internals/function-call');
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var iterate = require('../internals/iterate');
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var aCallable = require('../internals/a-callable');
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// `Map.keyBy` method
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// https://github.com/tc39/proposal-collection-methods
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$({ target: 'Map', stat: true }, {
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keyBy: function keyBy(iterable, keyDerivative) {
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var newMap = new this();
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aCallable(keyDerivative);
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var setter = aCallable(newMap.set);
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iterate(iterable, function (element) {
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call(setter, newMap, keyDerivative(element), element);
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});
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return newMap;
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}
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});
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