tor-browser

The Tor Browser
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dflt-ary-ptrn-elem-id-init-undef.js (2030B)

      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/gen-func-decl-dflt.template
      4 /*---
      5 description: Destructuring initializer with an undefined value (generator function declaration (default parameter))
      6 esid: sec-generator-function-definitions-runtime-semantics-instantiatefunctionobject
      7 features: [generators, destructuring-binding, default-parameters]
      8 flags: [generated]
      9 info: |
     10    GeneratorDeclaration : function * ( FormalParameters ) { GeneratorBody }
     11 
     12        [...]
     13        2. Let F be GeneratorFunctionCreate(Normal, FormalParameters,
     14           GeneratorBody, scope, strict).
     15        [...]
     16 
     17    9.2.1 [[Call]] ( thisArgument, argumentsList)
     18 
     19    [...]
     20    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     21    [...]
     22 
     23    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     24 
     25    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     26    [...]
     27 
     28    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     29 
     30    [...]
     31    23. Let iteratorRecord be Record {[[iterator]]:
     32        CreateListIterator(argumentsList), [[done]]: false}.
     33    24. If hasDuplicates is true, then
     34        [...]
     35    25. Else,
     36        b. Let formalStatus be IteratorBindingInitialization for formals with
     37           iteratorRecord and env as arguments.
     38    [...]
     39 
     40    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     41 
     42    SingleNameBinding : BindingIdentifier Initializeropt
     43 
     44    [...]
     45    6. If Initializer is present and v is undefined, then
     46       a. Let defaultValue be the result of evaluating Initializer.
     47       b. Let v be GetValue(defaultValue).
     48       [...]
     49    7. If environment is undefined, return PutValue(lhs, v).
     50    8. Return InitializeReferencedBinding(lhs, v).
     51 ---*/
     52 
     53 var callCount = 0;
     54 function* f([x = 23] = [undefined]) {
     55  assert.sameValue(x, 23);
     56  callCount = callCount + 1;
     57 };
     58 f().next();
     59 assert.sameValue(callCount, 1, 'generator function invoked exactly once');
     60 
     61 reportCompare(0, 0);