1 | 'use strict';
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2 | var $ = require('../internals/export');
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3 | var call = require('../internals/function-call');
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4 | var aCallable = require('../internals/a-callable');
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5 | var anObject = require('../internals/an-object');
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6 | var getIteratorDirect = require('../internals/get-iterator-direct');
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7 | var getIteratorFlattenable = require('../internals/get-iterator-flattenable');
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8 | var createIteratorProxy = require('../internals/iterator-create-proxy');
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9 | var iteratorClose = require('../internals/iterator-close');
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10 | var IS_PURE = require('../internals/is-pure');
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11 |
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12 | var IteratorProxy = createIteratorProxy(function () {
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13 | var iterator = this.iterator;
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14 | var mapper = this.mapper;
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15 | var result, inner;
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16 |
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17 | while (true) {
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18 | if (inner = this.inner) try {
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19 | result = anObject(call(inner.next, inner.iterator));
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20 | if (!result.done) return result.value;
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21 | this.inner = null;
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22 | } catch (error) { iteratorClose(iterator, 'throw', error); }
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23 |
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24 | result = anObject(call(this.next, iterator));
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25 |
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26 | if (this.done = !!result.done) return;
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27 |
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28 | try {
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29 | this.inner = getIteratorFlattenable(mapper(result.value, this.counter++), false);
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30 | } catch (error) { iteratorClose(iterator, 'throw', error); }
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31 | }
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32 | });
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33 |
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34 |
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35 |
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36 | $({ target: 'Iterator', proto: true, real: true, forced: IS_PURE }, {
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37 | flatMap: function flatMap(mapper) {
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38 | anObject(this);
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39 | aCallable(mapper);
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40 | return new IteratorProxy(getIteratorDirect(this), {
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41 | mapper: mapper,
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42 | inner: null
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43 | });
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44 | }
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45 | });
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