tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-params-arg-val-not-undefined.js (2541B)

      1 // |reftest| async
      2 // This file was procedurally generated from the following sources:
      3 // - src/function-forms/dflt-params-arg-val-not-undefined.case
      4 // - src/function-forms/default/async-arrow-function.template
      5 /*---
      6 description: Use of initializer when argument value is not `undefined` (async arrow function expression)
      7 esid: sec-async-arrow-function-definitions
      8 features: [default-parameters, async-functions]
      9 flags: [generated, async]
     10 info: |
     11    14.7 Async Arrow Function Definitions
     12 
     13    AsyncArrowFunction :
     14      ...
     15      CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody
     16 
     17    AsyncConciseBody :
     18      { AsyncFunctionBody }
     19 
     20    ...
     21 
     22    Supplemental Syntax
     23 
     24    When processing an instance of the production AsyncArrowFunction :
     25    CoverCallExpressionAndAsyncArrowHead => AsyncConciseBody the interpretation of
     26    CoverCallExpressionAndAsyncArrowHead is refined using the following grammar:
     27 
     28    AsyncArrowHead :
     29      async ArrowFormalParameters
     30 
     31 
     32    14.1.19 Runtime Semantics: IteratorBindingInitialization
     33 
     34    FormalsList : FormalsList , FormalParameter
     35 
     36    [...]
     37    23. Let iteratorRecord be Record {[[Iterator]]:
     38        CreateListIterator(argumentsList), [[Done]]: false}.
     39    24. If hasDuplicates is true, then
     40        [...]
     41    25. Else,
     42        a. Perform ? IteratorBindingInitialization for formals with
     43           iteratorRecord and env as arguments.
     44    [...]
     45 
     46 ---*/
     47 var obj = {};
     48 var falseCount = 0;
     49 var stringCount = 0;
     50 var nanCount = 0;
     51 var zeroCount = 0;
     52 var nullCount = 0;
     53 var objCount = 0;
     54 
     55 
     56 var callCount = 0;
     57 
     58 // Stores a reference `ref` for case evaluation
     59 var ref = async (aFalse = falseCount +=1, aString = stringCount += 1, aNaN = nanCount += 1, a0 = zeroCount += 1, aNull = nullCount += 1, aObj = objCount +=1) => {
     60  assert.sameValue(aFalse, false);
     61  assert.sameValue(aString, '');
     62  assert.sameValue(aNaN, NaN);
     63  assert.sameValue(a0, 0);
     64  assert.sameValue(aNull, null);
     65  assert.sameValue(aObj, obj);
     66  callCount = callCount + 1;
     67 };
     68 
     69 ref(false, '', NaN, 0, null, obj).then(() => {
     70  assert.sameValue(callCount, 1, 'async arrow function invoked exactly once')
     71 }).then($DONE, $DONE);
     72 
     73 assert.sameValue(falseCount, 0, 'initializer not evaluated: false');
     74 assert.sameValue(stringCount, 0, 'initializer not evaluated: string');
     75 assert.sameValue(nanCount, 0, 'initializer not evaluated: NaN');
     76 assert.sameValue(zeroCount, 0, 'initializer not evaluated: 0');
     77 assert.sameValue(nullCount, 0, 'initializer not evaluated: null');
     78 assert.sameValue(objCount, 0, 'initializer not evaluated: object');