tor-browser

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

obj-ptrn-id-init-skipped.js (1939B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/obj-ptrn-id-init-skipped.case
      3 // - src/dstr-binding/default/arrow-function.template
      4 /*---
      5 description: Destructuring initializer is not evaluated when value is not `undefined` (arrow function expression)
      6 esid: sec-arrow-function-definitions-runtime-semantics-evaluation
      7 features: [destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    ArrowFunction : ArrowParameters => ConciseBody
     11 
     12    [...]
     13    4. Let closure be FunctionCreate(Arrow, parameters, ConciseBody, scope, strict).
     14    [...]
     15 
     16    9.2.1 [[Call]] ( thisArgument, argumentsList)
     17 
     18    [...]
     19    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     20    [...]
     21 
     22    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     23 
     24    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     25    [...]
     26 
     27    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     28 
     29    [...]
     30    23. Let iteratorRecord be Record {[[iterator]]:
     31        CreateListIterator(argumentsList), [[done]]: false}.
     32    24. If hasDuplicates is true, then
     33        [...]
     34    25. Else,
     35        b. Let formalStatus be IteratorBindingInitialization for formals with
     36           iteratorRecord and env as arguments.
     37    [...]
     38 
     39    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
     40 
     41    SingleNameBinding : BindingIdentifier Initializeropt
     42 
     43    [...]
     44    6. If Initializer is present and v is undefined, then
     45       [...]
     46    [...]
     47 ---*/
     48 var initCount = 0;
     49 function counter() {
     50  initCount += 1;
     51 }
     52 
     53 var callCount = 0;
     54 var f;
     55 f = ({ w = counter(), x = counter(), y = counter(), z = counter() }) => {
     56  assert.sameValue(w, null);
     57  assert.sameValue(x, 0);
     58  assert.sameValue(y, false);
     59  assert.sameValue(z, '');
     60  assert.sameValue(initCount, 0);
     61  callCount = callCount + 1;
     62 };
     63 
     64 f({ w: null, x: 0, y: false, z: '' });
     65 assert.sameValue(callCount, 1, 'arrow function invoked exactly once');
     66 
     67 reportCompare(0, 0);