tor-browser

The Tor Browser
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meth-dflt-ary-ptrn-elem-id-init-skipped.js (2877B)

      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/cls-decl-meth-dflt.template
      4 /*---
      5 description: Destructuring initializer is not evaluated when value is not `undefined` (class expression method (default parameter))
      6 esid: sec-runtime-semantics-bindingclassdeclarationevaluation
      7 features: [destructuring-binding, default-parameters]
      8 flags: [generated]
      9 info: |
     10    ClassDeclaration : class BindingIdentifier ClassTail
     11 
     12    1. Let className be StringValue of BindingIdentifier.
     13    2. Let value be the result of ClassDefinitionEvaluation of ClassTail with
     14       argument className.
     15    [...]
     16 
     17    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
     18 
     19    21. For each ClassElement m in order from methods
     20        a. If IsStatic of m is false, then
     21           i. Let status be the result of performing
     22              PropertyDefinitionEvaluation for m with arguments proto and
     23              false.
     24        [...]
     25 
     26    14.3.8 Runtime Semantics: DefineMethod
     27 
     28    MethodDefinition : PropertyName ( StrictFormalParameters ) { FunctionBody }
     29 
     30    [...]
     31    6. Let closure be FunctionCreate(kind, StrictFormalParameters, FunctionBody,
     32       scope, strict). If functionPrototype was passed as a parameter then pass its
     33       value as the functionPrototype optional argument of FunctionCreate.
     34    [...]
     35 
     36    9.2.1 [[Call]] ( thisArgument, argumentsList)
     37 
     38    [...]
     39    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     40    [...]
     41 
     42    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     43 
     44    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     45    [...]
     46 
     47    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     48 
     49    [...]
     50    23. Let iteratorRecord be Record {[[iterator]]:
     51        CreateListIterator(argumentsList), [[done]]: false}.
     52    24. If hasDuplicates is true, then
     53        [...]
     54    25. Else,
     55        b. Let formalStatus be IteratorBindingInitialization for formals with
     56           iteratorRecord and env as arguments.
     57    [...]
     58 
     59    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     60 
     61    SingleNameBinding : BindingIdentifier Initializeropt
     62 
     63    [...]
     64    6. If Initializer is present and v is undefined, then
     65       [...]
     66    7. If environment is undefined, return PutValue(lhs, v).
     67    8. Return InitializeReferencedBinding(lhs, v).
     68 ---*/
     69 var initCount = 0;
     70 function counter() {
     71  initCount += 1;
     72 }
     73 
     74 var callCount = 0;
     75 class C {
     76  method([w = counter(), x = counter(), y = counter(), z = counter()] = [null, 0, false, '']) {
     77    assert.sameValue(w, null);
     78    assert.sameValue(x, 0);
     79    assert.sameValue(y, false);
     80    assert.sameValue(z, '');
     81    assert.sameValue(initCount, 0);
     82    callCount = callCount + 1;
     83  }
     84 };
     85 
     86 new C().method();
     87 assert.sameValue(callCount, 1, 'method invoked exactly once');
     88 
     89 reportCompare(0, 0);