1 | var aFunction = require('../internals/a-function');
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2 | var toObject = require('../internals/to-object');
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3 | var IndexedObject = require('../internals/indexed-object');
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4 | var toLength = require('../internals/to-length');
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5 |
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6 |
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7 | var createMethod = function (IS_RIGHT) {
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8 | return function (that, callbackfn, argumentsLength, memo) {
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9 | aFunction(callbackfn);
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10 | var O = toObject(that);
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11 | var self = IndexedObject(O);
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12 | var length = toLength(O.length);
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13 | var index = IS_RIGHT ? length - 1 : 0;
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14 | var i = IS_RIGHT ? -1 : 1;
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15 | if (argumentsLength < 2) while (true) {
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16 | if (index in self) {
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17 | memo = self[index];
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18 | index += i;
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19 | break;
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20 | }
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21 | index += i;
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22 | if (IS_RIGHT ? index < 0 : length <= index) {
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23 | throw TypeError('Reduce of empty array with no initial value');
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24 | }
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25 | }
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26 | for (;IS_RIGHT ? index >= 0 : length > index; index += i) if (index in self) {
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27 | memo = callbackfn(memo, self[index], index, O);
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28 | }
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29 | return memo;
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30 | };
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31 | };
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32 |
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33 | module.exports = {
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34 |
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35 |
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36 | left: createMethod(false),
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37 |
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38 |
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39 | right: createMethod(true)
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40 | };
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