tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-params-arg-val-undefined.js (2971B)

      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-expr-meth.template
      4 /*---
      5 description: Use of initializer when argument value is `undefined` (class expression method)
      6 esid: sec-class-definitions-runtime-semantics-evaluation
      7 features: [default-parameters]
      8 flags: [generated]
      9 info: |
     10    ClassExpression : class BindingIdentifieropt ClassTail
     11 
     12    1. If BindingIdentifieropt is not present, let className be undefined.
     13    2. Else, let className be StringValue of BindingIdentifier.
     14    3. Let value be the result of ClassDefinitionEvaluation of ClassTail
     15       with argument className.
     16    [...]
     17 
     18    14.5.14 Runtime Semantics: ClassDefinitionEvaluation
     19 
     20    21. For each ClassElement m in order from methods
     21        a. If IsStatic of m is false, then
     22           i. Let status be the result of performing
     23              PropertyDefinitionEvaluation for m with arguments proto and
     24              false.
     25        [...]
     26 
     27    14.3.8 Runtime Semantics: DefineMethod
     28 
     29    MethodDefinition : PropertyName ( StrictFormalParameters ) { FunctionBody }
     30 
     31    [...]
     32    6. Let closure be FunctionCreate(kind, StrictFormalParameters, FunctionBody,
     33       scope, strict). If functionPrototype was passed as a parameter then pass its
     34       value as the functionPrototype optional argument of FunctionCreate.
     35    [...]
     36 
     37    9.2.1 [[Call]] ( thisArgument, argumentsList)
     38 
     39    [...]
     40    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     41    [...]
     42 
     43    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     44 
     45    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     46    [...]
     47 
     48    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     49 
     50    [...]
     51    23. Let iteratorRecord be Record {[[iterator]]:
     52        CreateListIterator(argumentsList), [[done]]: false}.
     53    24. If hasDuplicates is true, then
     54        [...]
     55    25. Else,
     56        b. Let formalStatus be IteratorBindingInitialization for formals with
     57           iteratorRecord and env as arguments.
     58    [...]
     59 
     60    14.1.19 Runtime Semantics: IteratorBindingInitialization
     61 
     62    FormalsList : FormalsList , FormalParameter
     63 
     64    [...]
     65    23. Let iteratorRecord be Record {[[Iterator]]:
     66        CreateListIterator(argumentsList), [[Done]]: false}.
     67    24. If hasDuplicates is true, then
     68        [...]
     69    25. Else,
     70        a. Perform ? IteratorBindingInitialization for formals with
     71           iteratorRecord and env as arguments.
     72    [...]
     73 
     74 ---*/
     75 
     76 var callCount = 0;
     77 var C = class {
     78  method(fromLiteral = 23, fromExpr = 45, fromHole = 99) {
     79    assert.sameValue(fromLiteral, 23);
     80    assert.sameValue(fromExpr, 45);
     81    assert.sameValue(fromHole, 99);
     82    callCount = callCount + 1;
     83  }
     84 };
     85 
     86 C.prototype.method(undefined, void 0);
     87 
     88 // Stores a reference `ref` for case evaluation
     89 var ref = C.prototype.method;
     90 
     91 assert.sameValue(callCount, 1, 'method invoked exactly once');
     92 
     93 reportCompare(0, 0);