tor-browser

The Tor Browser
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meth-dflt-ary-ptrn-elem-id-init-undef.js (2079B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-elem-id-init-undef.case
      3 // - src/dstr-binding/default/meth-dflt.template
      4 /*---
      5 description: Destructuring initializer with an undefined value (method (default parameter))
      6 esid: sec-runtime-semantics-definemethod
      7 features: [destructuring-binding, default-parameters]
      8 flags: [generated]
      9 info: |
     10    MethodDefinition : PropertyName ( StrictFormalParameters ) { FunctionBody }
     11 
     12    [...]
     13    6. Let closure be FunctionCreate(kind, StrictFormalParameters,
     14       FunctionBody, scope, strict). If functionPrototype was passed as a
     15       parameter then pass its value as the functionPrototype optional argument
     16       of FunctionCreate.
     17    [...]
     18 
     19    9.2.1 [[Call]] ( thisArgument, argumentsList)
     20 
     21    [...]
     22    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     23    [...]
     24 
     25    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     26 
     27    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     28    [...]
     29 
     30    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     31 
     32    [...]
     33    23. Let iteratorRecord be Record {[[iterator]]:
     34        CreateListIterator(argumentsList), [[done]]: false}.
     35    24. If hasDuplicates is true, then
     36        [...]
     37    25. Else,
     38        b. Let formalStatus be IteratorBindingInitialization for formals with
     39           iteratorRecord and env as arguments.
     40    [...]
     41 
     42    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     43 
     44    SingleNameBinding : BindingIdentifier Initializeropt
     45 
     46    [...]
     47    6. If Initializer is present and v is undefined, then
     48       a. Let defaultValue be the result of evaluating Initializer.
     49       b. Let v be GetValue(defaultValue).
     50       [...]
     51    7. If environment is undefined, return PutValue(lhs, v).
     52    8. Return InitializeReferencedBinding(lhs, v).
     53 ---*/
     54 
     55 var callCount = 0;
     56 var obj = {
     57  method([x = 23] = [undefined]) {
     58    assert.sameValue(x, 23);
     59    callCount = callCount + 1;
     60  }
     61 };
     62 
     63 obj.method();
     64 assert.sameValue(callCount, 1, 'method invoked exactly once');
     65 
     66 reportCompare(0, 0);