tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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ary-ptrn-elem-id-init-skipped.js (2094B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-elem-id-init-skipped.case
      3 // - src/dstr-binding/default/func-decl.template
      4 /*---
      5 description: Destructuring initializer is not evaluated when value is not `undefined` (function declaration)
      6 esid: sec-function-definitions-runtime-semantics-instantiatefunctionobject
      7 features: [destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    FunctionDeclaration :
     11        function BindingIdentifier ( FormalParameters ) { FunctionBody }
     12 
     13        [...]
     14        3. Let F be FunctionCreate(Normal, FormalParameters, FunctionBody,
     15           scope, strict).
     16        [...]
     17 
     18    9.2.1 [[Call]] ( thisArgument, argumentsList)
     19 
     20    [...]
     21    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     22    [...]
     23 
     24    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     25 
     26    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     27    [...]
     28 
     29    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     30 
     31    [...]
     32    23. Let iteratorRecord be Record {[[iterator]]:
     33        CreateListIterator(argumentsList), [[done]]: false}.
     34    24. If hasDuplicates is true, then
     35        [...]
     36    25. Else,
     37        b. Let formalStatus be IteratorBindingInitialization for formals with
     38           iteratorRecord and env as arguments.
     39    [...]
     40 
     41    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     42 
     43    SingleNameBinding : BindingIdentifier Initializeropt
     44 
     45    [...]
     46    6. If Initializer is present and v is undefined, then
     47       [...]
     48    7. If environment is undefined, return PutValue(lhs, v).
     49    8. Return InitializeReferencedBinding(lhs, v).
     50 ---*/
     51 var initCount = 0;
     52 function counter() {
     53  initCount += 1;
     54 }
     55 
     56 var callCount = 0;
     57 function f([w = counter(), x = counter(), y = counter(), z = counter()]) {
     58  assert.sameValue(w, null);
     59  assert.sameValue(x, 0);
     60  assert.sameValue(y, false);
     61  assert.sameValue(z, '');
     62  assert.sameValue(initCount, 0);
     63  callCount = callCount + 1;
     64 };
     65 f([null, 0, false, '']);
     66 assert.sameValue(callCount, 1, 'function invoked exactly once');
     67 
     68 reportCompare(0, 0);