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33 lines
1.1 KiB
33 lines
1.1 KiB
'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 apply = require('../internals/function-apply'); |
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var call = require('../internals/function-call'); |
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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 (Promise, args) { |
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var iterator = this.iterator; |
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var returnMethod, result; |
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if (!this.remaining--) { |
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result = { done: true, value: undefined }; |
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this.done = true; |
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returnMethod = iterator['return']; |
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if (returnMethod !== undefined) { |
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return Promise.resolve(call(returnMethod, iterator)).then(function () { |
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return result; |
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}); |
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} |
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return result; |
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} return apply(this.next, iterator, args); |
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}); |
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$({ target: 'AsyncIterator', proto: true, real: true, forced: 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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