tor-browser

The Tor Browser
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mapfn-sync-arraylike.js (908B)

      1 // |reftest| async
      2 // Copyright (C) 2023 Igalia, S.L. All rights reserved.
      3 // This code is governed by the BSD license found in the LICENSE file.
      4 
      5 /*---
      6 esid: sec-array.fromasync
      7 description: >
      8  A synchronous mapping function is applied to each (awaited) item of an
      9  arraylike.
     10 info: |
     11  3.k.vii.4. If _mapping_ is *true*, then
     12    a. Let _mappedValue_ be ? Call(_mapfn_, _thisArg_, « _nextValue_, 𝔽(_k_) »).
     13    ...
     14  ...
     15  6. Perform ? CreateDataPropertyOrThrow(_A_, _Pk_, _mappedValue_).
     16 flags: [async]
     17 includes: [asyncHelpers.js, compareArray.js]
     18 features: [Array.fromAsync]
     19 ---*/
     20 
     21 const arrayLike = {
     22  length: 4,
     23  0: 0,
     24  1: 2,
     25  2: Promise.resolve(4),
     26  3: 6,
     27 };
     28 
     29 function syncMap(val, ix) {
     30  return val * ix;
     31 }
     32 
     33 asyncTest(async () => {
     34  const result = await Array.fromAsync(arrayLike, syncMap);
     35  assert.compareArray(result, [0, 2, 8, 18], "sync mapfn should be applied to arraylike");
     36 });