1 | 'use strict';
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2 | var toIndexedObject = require('../internals/to-indexed-object');
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3 | var addToUnscopables = require('../internals/add-to-unscopables');
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4 | var Iterators = require('../internals/iterators');
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5 | var InternalStateModule = require('../internals/internal-state');
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6 | var defineIterator = require('../internals/define-iterator');
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7 |
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8 | var ARRAY_ITERATOR = 'Array Iterator';
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9 | var setInternalState = InternalStateModule.set;
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10 | var getInternalState = InternalStateModule.getterFor(ARRAY_ITERATOR);
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11 |
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12 | // `Array.prototype.entries` method
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13 | // https://tc39.es/ecma262/#sec-array.prototype.entries
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14 | // `Array.prototype.keys` method
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15 | // https://tc39.es/ecma262/#sec-array.prototype.keys
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16 | // `Array.prototype.values` method
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17 | // https://tc39.es/ecma262/#sec-array.prototype.values
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18 | // `Array.prototype[@@iterator]` method
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19 | // https://tc39.es/ecma262/#sec-array.prototype-@@iterator
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20 | // `CreateArrayIterator` internal method
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21 | // https://tc39.es/ecma262/#sec-createarrayiterator
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22 | module.exports = defineIterator(Array, 'Array', function (iterated, kind) {
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23 | setInternalState(this, {
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24 | type: ARRAY_ITERATOR,
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25 | target: toIndexedObject(iterated), // target
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26 | index: 0, // next index
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27 | kind: kind // kind
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28 | });
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29 | // `%ArrayIteratorPrototype%.next` method
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30 | // https://tc39.es/ecma262/#sec-%arrayiteratorprototype%.next
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31 | }, function () {
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32 | var state = getInternalState(this);
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33 | var target = state.target;
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34 | var kind = state.kind;
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35 | var index = state.index++;
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36 | if (!target || index >= target.length) {
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37 | state.target = undefined;
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38 | return { value: undefined, done: true };
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39 | }
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40 | if (kind == 'keys') return { value: index, done: false };
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41 | if (kind == 'values') return { value: target[index], done: false };
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42 | return { value: [index, target[index]], done: false };
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43 | }, 'values');
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44 |
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45 | // argumentsList[@@iterator] is %ArrayProto_values%
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46 | // https://tc39.es/ecma262/#sec-createunmappedargumentsobject
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47 | // https://tc39.es/ecma262/#sec-createmappedargumentsobject
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48 | Iterators.Arguments = Iterators.Array;
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49 |
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50 | // https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
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51 | addToUnscopables('keys');
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52 | addToUnscopables('values');
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53 | addToUnscopables('entries');
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