1 | 'use strict';
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2 | var charAt = require('../internals/string-multibyte').charAt;
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3 | var InternalStateModule = require('../internals/internal-state');
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4 | var defineIterator = require('../internals/define-iterator');
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5 |
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6 | var STRING_ITERATOR = 'String Iterator';
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7 | var setInternalState = InternalStateModule.set;
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8 | var getInternalState = InternalStateModule.getterFor(STRING_ITERATOR);
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9 |
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10 |
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11 |
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12 | defineIterator(String, 'String', function (iterated) {
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13 | setInternalState(this, {
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14 | type: STRING_ITERATOR,
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15 | string: String(iterated),
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16 | index: 0
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17 | });
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18 |
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19 |
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20 | }, function next() {
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21 | var state = getInternalState(this);
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22 | var string = state.string;
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23 | var index = state.index;
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24 | var point;
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25 | if (index >= string.length) return { value: undefined, done: true };
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26 | point = charAt(string, index);
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27 | state.index += point.length;
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28 | return { value: point, done: false };
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29 | });
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