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- 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
889 B
JavaScript
36 lines
889 B
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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A synchronous mapping function is applied to each (awaited) item of an
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arraylike.
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info: |
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3.k.vii.4. 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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...
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6. Perform ? 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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const arrayLike = {
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length: 4,
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0: 0,
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1: 2,
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2: Promise.resolve(4),
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3: 6,
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};
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function syncMap(val, ix) {
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return val * ix;
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}
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asyncTest(async () => {
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const result = await Array.fromAsync(arrayLike, syncMap);
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assert.compareArray(result, [0, 2, 8, 18], "sync mapfn should be applied to arraylike");
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});
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