tor-browser

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

      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/cls-decl-private-meth-dflt.template
      4 /*---
      5 description: Destructuring initializer is not evaluated when value is not `undefined` (private class expression method (default parameter))
      6 esid: sec-runtime-semantics-bindingclassdeclarationevaluation
      7 features: [class, class-methods-private, 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    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
     60 
     61    SingleNameBinding : BindingIdentifier Initializeropt
     62 
     63    [...]
     64    6. If Initializer is present and v is undefined, then
     65       [...]
     66    [...]
     67 ---*/
     68 var initCount = 0;
     69 function counter() {
     70  initCount += 1;
     71 }
     72 
     73 var callCount = 0;
     74 class C {
     75  #method({ w = counter(), x = counter(), y = counter(), z = counter() } = { w: null, x: 0, y: false, z: '' }) {
     76    assert.sameValue(w, null);
     77    assert.sameValue(x, 0);
     78    assert.sameValue(y, false);
     79    assert.sameValue(z, '');
     80    assert.sameValue(initCount, 0);
     81    callCount = callCount + 1;
     82  }
     83 
     84  get method() {
     85    return this.#method;
     86  }
     87 };
     88 
     89 new C().method();
     90 assert.sameValue(callCount, 1, 'method invoked exactly once');
     91 
     92 reportCompare(0, 0);