| 1 | 'use strict';
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| 2 | var $ = require('../internals/export');
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| 3 | var call = require('../internals/function-call');
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| 4 | var iterate = require('../internals/iterate');
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| 5 | var isCallable = require('../internals/is-callable');
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| 6 | var aCallable = require('../internals/a-callable');
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| 7 | var Map = require('../internals/map-helpers').Map;
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| 8 |
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| 9 |
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| 10 |
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| 11 | $({ target: 'Map', stat: true, forced: true }, {
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| 12 | keyBy: function keyBy(iterable, keyDerivative) {
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| 13 | var C = isCallable(this) ? this : Map;
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| 14 | var newMap = new C();
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| 15 | aCallable(keyDerivative);
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| 16 | var setter = aCallable(newMap.set);
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| 17 | iterate(iterable, function (element) {
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| 18 | call(setter, newMap, keyDerivative(element), element);
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| 19 | });
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| 20 | return newMap;
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| 21 | }
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| 22 | });
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