es.string.iterator.js
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es.string.iterator.js
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	'use strict';
	var charAt = require('../internals/string-multibyte').charAt;
	var toString = require('../internals/to-string');
	var InternalStateModule = require('../internals/internal-state');
	var defineIterator = require('../internals/iterator-define');

	var STRING_ITERATOR = 'String Iterator';
	var setInternalState = InternalStateModule.set;
	var getInternalState = InternalStateModule.getterFor(STRING_ITERATOR);

	// `String.prototype[@@iterator]` method
	// https://tc39.es/ecma262/#sec-string.prototype-@@iterator
	defineIterator(String, 'String', function (iterated) {
	setInternalState(this, {
	type: STRING_ITERATOR,
	string: toString(iterated),
	index: 0
	});
	// `%StringIteratorPrototype%.next` method
	// https://tc39.es/ecma262/#sec-%stringiteratorprototype%.next
	}, function next() {
	var state = getInternalState(this);
	var string = state.string;
	var index = state.index;
	var point;
	if (index >= string.length) return { value: undefined, done: true };
	point = charAt(string, index);
	state.index += point.length;
	return { value: point, done: false };
	});