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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
48 lines
1.3 KiB
JavaScript
48 lines
1.3 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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The returned value from each invocation of the asynchronous mapping function
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is awaited exactly once.
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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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flags: [async]
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includes: [asyncHelpers.js, compareArray.js, temporalHelpers.js]
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features: [Array.fromAsync]
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---*/
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const calls = [];
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const expected = [
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"call mapping",
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"get thenable_0.then",
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"call thenable_0.then",
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"call mapping",
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"get thenable_1.then",
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"call thenable_1.then",
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"call mapping",
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"get thenable_2.then",
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"call thenable_2.then",
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];
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function mapping(val, ix) {
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calls.push("call mapping");
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const thenableName = `thenable_${ix}`;
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return TemporalHelpers.propertyBagObserver(calls, {
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then(resolve, reject) {
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calls.push(`call ${thenableName}.then`);
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resolve(val * 2);
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}
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}, thenableName)
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}
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asyncTest(async () => {
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const result = await Array.fromAsync([1, 2, 3], mapping);
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assert.compareArray(result, [2, 4, 6], "mapping function applied");
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assert.compareArray(calls, expected, "observable operations");
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});
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