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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 createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
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7 |
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8 | var AsyncIteratorProxy = createAsyncIteratorProxy(function (arg, Promise) {
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9 | var iterator = this.iterator;
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10 | var returnMethod, result;
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11 | if (!this.remaining--) {
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12 | result = { done: true, value: undefined };
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13 | this.done = true;
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14 | returnMethod = iterator['return'];
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15 | if (returnMethod !== undefined) {
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16 | return Promise.resolve(returnMethod.call(iterator)).then(function () {
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17 | return result;
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18 | });
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19 | }
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20 | return result;
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21 | } return this.next.call(iterator, arg);
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22 | });
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23 |
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24 | $({ target: 'AsyncIterator', proto: true, real: true }, {
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25 | take: function take(limit) {
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26 | return new AsyncIteratorProxy({
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27 | iterator: anObject(this),
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28 | remaining: toPositiveInteger(limit)
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29 | });
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30 | }
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31 | });
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