| 1 | 'use strict';
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| 2 | var $ = require('../internals/export');
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| 3 | var aCallable = require('../internals/a-callable');
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| 4 | var aMap = require('../internals/a-map');
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| 5 | var iterate = require('../internals/map-iterate');
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| 6 |
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| 7 | var $TypeError = TypeError;
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| 8 |
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| 9 |
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| 10 |
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| 11 | $({ target: 'Map', proto: true, real: true, forced: true }, {
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| 12 | reduce: function reduce(callbackfn /* , initialValue */) {
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| 13 | var map = aMap(this);
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| 14 | var noInitial = arguments.length < 2;
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| 15 | var accumulator = noInitial ? undefined : arguments[1];
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| 16 | aCallable(callbackfn);
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| 17 | iterate(map, function (value, key) {
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| 18 | if (noInitial) {
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| 19 | noInitial = false;
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| 20 | accumulator = value;
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| 21 | } else {
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| 22 | accumulator = callbackfn(accumulator, value, key, map);
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| 23 | }
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| 24 | });
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| 25 | if (noInitial) throw new $TypeError('Reduce of empty map with no initial value');
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| 26 | return accumulator;
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| 27 | }
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| 28 | });
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