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18 lines
714 B
JavaScript
18 lines
714 B
JavaScript
// Copyright (C) 2024 André Bargull and Michael Ficarra. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-iterator.concat
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description: >
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The value of the [[Prototype]] internal slot of the return value of Iterator.concat
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is the intrinsic object %IteratorHelperPrototype%.
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features: [iterator-sequencing]
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---*/
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var iter = Iterator.concat();
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assert(iter instanceof Iterator, "Iterator.concat() must return an Iterator");
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var customIter = { next() { return { done: true, value: undefined }; } };
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iter = Iterator.concat({ [Symbol.iterator]() { return customIter; } });
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assert(iter instanceof Iterator, "Iterator.concat(...) must return an Iterator");
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