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31 lines
1.1 KiB
31 lines
1.1 KiB
3 years ago
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'use strict';
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var charAt = require('../internals/string-multibyte').charAt;
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var toString = require('../internals/to-string');
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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 STRING_ITERATOR = 'String Iterator';
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var setInternalState = InternalStateModule.set;
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var getInternalState = InternalStateModule.getterFor(STRING_ITERATOR);
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// `String.prototype[@@iterator]` method
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// https://tc39.es/ecma262/#sec-string.prototype-@@iterator
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defineIterator(String, 'String', function (iterated) {
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setInternalState(this, {
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type: STRING_ITERATOR,
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string: toString(iterated),
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index: 0
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});
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// `%StringIteratorPrototype%.next` method
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// https://tc39.es/ecma262/#sec-%stringiteratorprototype%.next
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}, function next() {
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var state = getInternalState(this);
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var string = state.string;
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var index = state.index;
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var point;
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if (index >= string.length) return { value: undefined, done: true };
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point = charAt(string, index);
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state.index += point.length;
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return { value: point, done: false };
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});
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