tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

resolve-thenable.js (1437B)

      1 // |reftest| async
      2 // Copyright (C) 2016 the V8 project authors. All rights reserved.
      3 // This code is governed by the BSD license found in the LICENSE file.
      4 /*---
      5 description: Resolving with a thenable object value
      6 es6id: 25.4.4.3
      7 info: |
      8    [...]
      9    6. Let promiseCapability be NewPromiseCapability(C).
     10    [...]
     11    11. Let result be PerformPromiseRace(iteratorRecord, promiseCapability, C).
     12    [...]
     13 
     14    25.4.4.3.1 Runtime Semantics: PerformPromiseRace
     15    1. Repeat
     16       [...]
     17       j. Let result be Invoke(nextPromise, "then",
     18          «promiseCapability.[[Resolve]], promiseCapability.[[Reject]]»).
     19 
     20    25.4.1.3.2 Promise Resolve Functions
     21    [...]
     22    8. Let then be Get(resolution, "then").
     23    9. If then is an abrupt completion, then
     24       [...]
     25    10. Let thenAction be then.[[value]].
     26    11. If IsCallable(thenAction) is false, then
     27        [...]
     28    12. Perform EnqueueJob ("PromiseJobs", PromiseResolveThenableJob,
     29        «promise, resolution, thenAction»)
     30 flags: [async]
     31 ---*/
     32 
     33 var value = {};
     34 var thenableValue = {
     35  then: function(resolve) {
     36    resolve(value);
     37  }
     38 };
     39 var thenable = {
     40  then: function(resolve) {
     41    resolve(thenableValue);
     42  }
     43 };
     44 
     45 Promise.race([thenable])
     46  .then(function(val) {
     47    if (val !== value) {
     48      $DONE('The promise should be resolved with the correct value.');
     49      return;
     50    }
     51    $DONE();
     52  }, function() {
     53    $DONE('The promise should not be rejected.');
     54  });