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34 lines
1.1 KiB
34 lines
1.1 KiB
3 years ago
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'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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