Last change
on this file was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
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[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 anObject = require('../internals/an-object');
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| 5 | var aFunction = require('../internals/a-function');
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| 6 | var getMapIterator = require('../internals/get-map-iterator');
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| 7 | var iterate = require('../internals/iterate');
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| 8 |
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| 9 | // `Map.prototype.reduce` method
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| 10 | // https://github.com/tc39/proposal-collection-methods
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| 11 | $({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
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| 12 | reduce: function reduce(callbackfn /* , initialValue */) {
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| 13 | var map = anObject(this);
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| 14 | var iterator = getMapIterator(map);
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| 15 | var noInitial = arguments.length < 2;
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| 16 | var accumulator = noInitial ? undefined : arguments[1];
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| 17 | aFunction(callbackfn);
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| 18 | iterate(iterator, function (key, value) {
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| 19 | if (noInitial) {
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| 20 | noInitial = false;
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| 21 | accumulator = value;
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| 22 | } else {
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| 23 | accumulator = callbackfn(accumulator, value, key, map);
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| 24 | }
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| 25 | }, { AS_ENTRIES: true, IS_ITERATOR: true });
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| 26 | if (noInitial) throw TypeError('Reduce of empty map with no initial value');
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| 27 | return accumulator;
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| 28 | }
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| 29 | });
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