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29 lines
969 B
29 lines
969 B
2 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 anObject = require('../internals/an-object');
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var toPositiveInteger = require('../internals/to-positive-integer');
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var createIteratorProxy = require('../internals/iterator-create-proxy');
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var iteratorClose = require('../internals/iterator-close');
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var IteratorProxy = createIteratorProxy(function (args) {
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var iterator = this.iterator;
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if (!this.remaining--) {
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this.done = true;
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return iteratorClose(iterator, 'normal', undefined);
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}
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var result = anObject(apply(this.next, iterator, args));
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var done = this.done = !!result.done;
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if (!done) return result.value;
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});
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$({ target: 'Iterator', proto: true, real: true, forced: true }, {
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take: function take(limit) {
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return new IteratorProxy({
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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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