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esnext.map.map-values.js
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esnext.map.map-values.js
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'use strict';
var $ = require('../internals/export');
var IS_PURE = require('../internals/is-pure');
var getBuiltIn = require('../internals/get-built-in');
var anObject = require('../internals/an-object');
var aFunction = require('../internals/a-function');
var bind = require('../internals/bind-context');
var speciesConstructor = require('../internals/species-constructor');
var getMapIterator = require('../internals/get-map-iterator');
// `Map.prototype.mapValues` method
// https://github.com/tc39/proposal-collection-methods
$({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
mapValues: function mapValues(callbackfn /* , thisArg */) {
var map = anObject(this);
var iterator = getMapIterator(map);
var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3);
var newMap = new (speciesConstructor(map, getBuiltIn('Map')))();
var setter = aFunction(newMap.set);
var step, entry, key;
while (!(step = iterator.next()).done) {
entry = step.value;
setter.call(newMap, key = entry[0], boundFunction(entry[1], key, map));
}
return newMap;
}
});