| 1 | 'use strict';
|
| 2 | var $ = require('../internals/export');
|
| 3 | var IS_PURE = require('../internals/is-pure');
|
| 4 | var anObject = require('../internals/an-object');
|
| 5 | var aFunction = require('../internals/a-function');
|
| 6 | var getMapIterator = require('../internals/get-map-iterator');
|
| 7 | var iterate = require('../internals/iterate');
|
| 8 |
|
| 9 |
|
| 10 |
|
| 11 | $({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
|
| 12 | reduce: function reduce(callbackfn /* , initialValue */) {
|
| 13 | var map = anObject(this);
|
| 14 | var iterator = getMapIterator(map);
|
| 15 | var noInitial = arguments.length < 2;
|
| 16 | var accumulator = noInitial ? undefined : arguments[1];
|
| 17 | aFunction(callbackfn);
|
| 18 | iterate(iterator, function (key, value) {
|
| 19 | if (noInitial) {
|
| 20 | noInitial = false;
|
| 21 | accumulator = value;
|
| 22 | } else {
|
| 23 | accumulator = callbackfn(accumulator, value, key, map);
|
| 24 | }
|
| 25 | }, undefined, true, true);
|
| 26 | if (noInitial) throw TypeError('Reduce of empty map with no initial value');
|
| 27 | return accumulator;
|
| 28 | }
|
| 29 | });
|