tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-params-arg-val-undefined.js (2886B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/function-forms/dflt-params-arg-val-undefined.case
      3 // - src/function-forms/default/cls-decl-meth.template
      4 /*---
      5 description: Use of initializer when argument value is `undefined` (class expression method)
      6 esid: sec-runtime-semantics-bindingclassdeclarationevaluation
      7 features: [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    14.1.19 Runtime Semantics: IteratorBindingInitialization
     60 
     61    FormalsList : FormalsList , FormalParameter
     62 
     63    [...]
     64    23. Let iteratorRecord be Record {[[Iterator]]:
     65        CreateListIterator(argumentsList), [[Done]]: false}.
     66    24. If hasDuplicates is true, then
     67        [...]
     68    25. Else,
     69        a. Perform ? IteratorBindingInitialization for formals with
     70           iteratorRecord and env as arguments.
     71    [...]
     72 
     73 ---*/
     74 
     75 var callCount = 0;
     76 class C {
     77  method(fromLiteral = 23, fromExpr = 45, fromHole = 99) {
     78    assert.sameValue(fromLiteral, 23);
     79    assert.sameValue(fromExpr, 45);
     80    assert.sameValue(fromHole, 99);
     81    callCount = callCount + 1;
     82  }
     83 }
     84 
     85 C.prototype.method(undefined, void 0);
     86 
     87 // Stores a reference `ref` for case evaluation
     88 var ref = C.prototype.method;
     89 
     90 assert.sameValue(callCount, 1, 'method invoked exactly once');
     91 
     92 reportCompare(0, 0);