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c4d8f01d3d
- normal case with synchronous and asynchronous mapfn - a non-callable value is passed as mapfn - behaviour of various values of thisArg in strict and sloppy mode - mapfn result is awaited once per iteration - iterator is closed when mapfn throws
36 lines
1.0 KiB
JavaScript
36 lines
1.0 KiB
JavaScript
// Copyright (C) 2023 Igalia, S.L. 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-array.fromasync
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description: >
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An asynchronous mapping function is applied to each item yielded by an
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asynchronous iterable.
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info: |
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3.j.ii.6. If _mapping_ is *true*, then
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a. Let _mappedValue_ be Call(_mapfn_, _thisArg_, « _nextValue_, 𝔽(_k_) »).
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...
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c. Set _mappedValue_ to Await(_mappedValue_).
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...
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...
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8. Let _defineStatus_ be CreateDataPropertyOrThrow(_A_, _Pk_, _mappedValue_).
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flags: [async]
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includes: [asyncHelpers.js, compareArray.js]
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features: [Array.fromAsync]
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---*/
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async function* asyncGen() {
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for (let i = 0; i < 4; i++) {
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yield Promise.resolve(i * 2);
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}
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}
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async function asyncMap(val, ix) {
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return Promise.resolve(val * ix);
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}
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asyncTest(async () => {
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const result = await Array.fromAsync({ [Symbol.asyncIterator]: asyncGen }, asyncMap);
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assert.compareArray(result, [0, 2, 8, 18], "async mapfn should be applied to async iterable");
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});
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