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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
40 lines
1.1 KiB
JavaScript
40 lines
1.1 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 iterator of an asynchronous iterable is closed when the synchronous
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mapping function throws.
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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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b. IfAbruptCloseAsyncIterator(_mappedValue_, _iteratorRecord_).
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...
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flags: [async]
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includes: [asyncHelpers.js]
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features: [Array.fromAsync]
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---*/
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let closed = false;
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const iterator = {
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next() {
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return Promise.resolve({ value: 1, done: false });
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},
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return() {
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closed = true;
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return Promise.resolve({ done: true });
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},
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[Symbol.asyncIterator]() {
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return this;
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}
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}
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asyncTest(async () => {
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await assert.throwsAsync(Error, () => Array.fromAsync(iterator, (val) => {
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assert.sameValue(val, 1, "mapfn receives value from iterator");
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throw new Error("mapfn throws");
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}), "sync mapfn throwing should cause fromAsync to reject");
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assert(closed, "sync mapfn throwing should close iterator")
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});
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