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63 lines
2.5 KiB
63 lines
2.5 KiB
4 weeks ago
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'use strict';
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var toIndexedObject = require('../internals/to-indexed-object');
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var addToUnscopables = require('../internals/add-to-unscopables');
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var Iterators = require('../internals/iterators');
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var InternalStateModule = require('../internals/internal-state');
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var defineProperty = require('../internals/object-define-property').f;
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var defineIterator = require('../internals/iterator-define');
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var createIterResultObject = require('../internals/create-iter-result-object');
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var IS_PURE = require('../internals/is-pure');
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var DESCRIPTORS = require('../internals/descriptors');
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var ARRAY_ITERATOR = 'Array Iterator';
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var setInternalState = InternalStateModule.set;
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var getInternalState = InternalStateModule.getterFor(ARRAY_ITERATOR);
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// `Array.prototype.entries` method
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// https://tc39.es/ecma262/#sec-array.prototype.entries
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// `Array.prototype.keys` method
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// https://tc39.es/ecma262/#sec-array.prototype.keys
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// `Array.prototype.values` method
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// https://tc39.es/ecma262/#sec-array.prototype.values
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// `Array.prototype[@@iterator]` method
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// https://tc39.es/ecma262/#sec-array.prototype-@@iterator
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// `CreateArrayIterator` internal method
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// https://tc39.es/ecma262/#sec-createarrayiterator
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module.exports = defineIterator(Array, 'Array', function (iterated, kind) {
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setInternalState(this, {
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type: ARRAY_ITERATOR,
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target: toIndexedObject(iterated), // target
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index: 0, // next index
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kind: kind // kind
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});
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// `%ArrayIteratorPrototype%.next` method
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// https://tc39.es/ecma262/#sec-%arrayiteratorprototype%.next
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}, function () {
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var state = getInternalState(this);
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var target = state.target;
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var index = state.index++;
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if (!target || index >= target.length) {
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state.target = null;
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return createIterResultObject(undefined, true);
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}
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switch (state.kind) {
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case 'keys': return createIterResultObject(index, false);
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case 'values': return createIterResultObject(target[index], false);
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} return createIterResultObject([index, target[index]], false);
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}, 'values');
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// argumentsList[@@iterator] is %ArrayProto_values%
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// https://tc39.es/ecma262/#sec-createunmappedargumentsobject
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// https://tc39.es/ecma262/#sec-createmappedargumentsobject
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var values = Iterators.Arguments = Iterators.Array;
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// https://tc39.es/ecma262/#sec-array.prototype-@@unscopables
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addToUnscopables('keys');
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addToUnscopables('values');
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addToUnscopables('entries');
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// V8 ~ Chrome 45- bug
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if (!IS_PURE && DESCRIPTORS && values.name !== 'values') try {
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defineProperty(values, 'name', { value: 'values' });
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} catch (error) { /* empty */ }
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