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1 | 'use strict';
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2 | // https://github.com/tc39/proposal-iterator-helpers
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3 | var $ = require('../internals/export');
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4 | var anObject = require('../internals/an-object');
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5 | var toPositiveInteger = require('../internals/to-positive-integer');
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6 | var createIteratorProxy = require('../internals/iterator-create-proxy');
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7 |
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8 | var IteratorProxy = createIteratorProxy(function (arg) {
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9 | var iterator = this.iterator;
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10 | var next = this.next;
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11 | var result, done;
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12 | while (this.remaining) {
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13 | this.remaining--;
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14 | result = anObject(next.call(iterator));
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15 | done = this.done = !!result.done;
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16 | if (done) return;
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17 | }
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18 | result = anObject(next.call(iterator, arg));
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19 | done = this.done = !!result.done;
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20 | if (!done) return result.value;
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21 | });
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22 |
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23 | $({ target: 'Iterator', proto: true, real: true }, {
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24 | drop: function drop(limit) {
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25 | return new IteratorProxy({
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26 | iterator: anObject(this),
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27 | remaining: toPositiveInteger(limit)
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28 | });
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29 | }
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30 | });
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