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23 lines
739 B
JavaScript
23 lines
739 B
JavaScript
'use strict';
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// https://github.com/tc39/proposal-iterator-helpers
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var $ = require('../internals/export');
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var anObject = require('../internals/an-object');
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var toPositiveInteger = require('../internals/to-positive-integer');
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var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
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var AsyncIteratorProxy = createAsyncIteratorProxy(function (arg) {
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if (!this.remaining--) {
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this.done = true;
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return { done: true, value: undefined };
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} return this.next.call(this.iterator, arg);
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});
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$({ target: 'AsyncIterator', proto: true, real: true }, {
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take: function take(limit) {
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return new AsyncIteratorProxy({
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iterator: anObject(this),
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remaining: toPositiveInteger(limit)
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});
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}
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});
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