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26 lines
1.1 KiB
26 lines
1.1 KiB
'use strict'; |
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var $ = require('../internals/export'); |
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var IS_PURE = require('../internals/is-pure'); |
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var getBuiltIn = require('../internals/get-built-in'); |
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var anObject = require('../internals/an-object'); |
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var aFunction = require('../internals/a-function'); |
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var bind = require('../internals/function-bind-context'); |
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var speciesConstructor = require('../internals/species-constructor'); |
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var getMapIterator = require('../internals/get-map-iterator'); |
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var iterate = require('../internals/iterate'); |
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// `Map.prototype.mapValues` method |
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// https://github.com/tc39/proposal-collection-methods |
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$({ target: 'Map', proto: true, real: true, forced: IS_PURE }, { |
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mapValues: function mapValues(callbackfn /* , thisArg */) { |
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var map = anObject(this); |
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var iterator = getMapIterator(map); |
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var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3); |
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var newMap = new (speciesConstructor(map, getBuiltIn('Map')))(); |
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var setter = aFunction(newMap.set); |
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iterate(iterator, function (key, value) { |
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setter.call(newMap, key, boundFunction(value, key, map)); |
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}, undefined, true, true); |
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return newMap; |
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} |
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});
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