| [6a3a178] | 1 | 'use strict';
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| 2 | var $ = require('../internals/export');
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| 3 | var IS_PURE = require('../internals/is-pure');
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| 4 | var getBuiltIn = require('../internals/get-built-in');
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| 5 | var anObject = require('../internals/an-object');
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| 6 | var aFunction = require('../internals/a-function');
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| 7 | var bind = require('../internals/function-bind-context');
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| 8 | var speciesConstructor = require('../internals/species-constructor');
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| 9 | var getMapIterator = require('../internals/get-map-iterator');
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| 10 | var iterate = require('../internals/iterate');
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| 11 |
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| 12 | // `Map.prototype.mapKeys` method
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| 13 | // https://github.com/tc39/proposal-collection-methods
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| 14 | $({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
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| 15 | mapKeys: function mapKeys(callbackfn /* , thisArg */) {
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| 16 | var map = anObject(this);
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| 17 | var iterator = getMapIterator(map);
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| 18 | var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3);
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| 19 | var newMap = new (speciesConstructor(map, getBuiltIn('Map')))();
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| 20 | var setter = aFunction(newMap.set);
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| 21 | iterate(iterator, function (key, value) {
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| 22 | setter.call(newMap, boundFunction(value, key, map), value);
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| 23 | }, { AS_ENTRIES: true, IS_ITERATOR: true });
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| 24 | return newMap;
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| 25 | }
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| 26 | });
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