54 lines
2.2 KiB
JavaScript
54 lines
2.2 KiB
JavaScript
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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 defineIterator = require('../internals/define-iterator');
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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.github.io/ecma262/#sec-array.prototype.entries
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// `Array.prototype.keys` method
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// https://tc39.github.io/ecma262/#sec-array.prototype.keys
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// `Array.prototype.values` method
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// https://tc39.github.io/ecma262/#sec-array.prototype.values
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// `Array.prototype[@@iterator]` method
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// https://tc39.github.io/ecma262/#sec-array.prototype-@@iterator
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// `CreateArrayIterator` internal method
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// https://tc39.github.io/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.github.io/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 kind = state.kind;
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var index = state.index++;
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if (!target || index >= target.length) {
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state.target = undefined;
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return { value: undefined, done: true };
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}
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if (kind == 'keys') return { value: index, done: false };
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if (kind == 'values') return { value: target[index], done: false };
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return { value: [index, target[index]], done: false };
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}, 'values');
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// argumentsList[@@iterator] is %ArrayProto_values%
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// https://tc39.github.io/ecma262/#sec-createunmappedargumentsobject
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// https://tc39.github.io/ecma262/#sec-createmappedargumentsobject
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Iterators.Arguments = Iterators.Array;
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// https://tc39.github.io/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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