tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-params-arg-val-undefined.js (2169B)

      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/gen-func-expr.template
      4 /*---
      5 description: Use of initializer when argument value is `undefined` (generator function expression)
      6 esid: sec-generator-function-definitions-runtime-semantics-evaluation
      7 features: [default-parameters, generators]
      8 flags: [generated]
      9 info: |
     10    GeneratorExpression : function * ( FormalParameters ) { GeneratorBody }
     11 
     12        [...]
     13        3. Let closure 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 
     41    14.1.19 Runtime Semantics: IteratorBindingInitialization
     42 
     43    FormalsList : FormalsList , FormalParameter
     44 
     45    [...]
     46    23. Let iteratorRecord be Record {[[Iterator]]:
     47        CreateListIterator(argumentsList), [[Done]]: false}.
     48    24. If hasDuplicates is true, then
     49        [...]
     50    25. Else,
     51        a. Perform ? IteratorBindingInitialization for formals with
     52           iteratorRecord and env as arguments.
     53    [...]
     54 
     55 ---*/
     56 
     57 var callCount = 0;
     58 // Stores a reference `ref` for case evaluation
     59 var ref;
     60 ref = function*(fromLiteral = 23, fromExpr = 45, fromHole = 99) {
     61  assert.sameValue(fromLiteral, 23);
     62  assert.sameValue(fromExpr, 45);
     63  assert.sameValue(fromHole, 99);
     64  callCount = callCount + 1;
     65 };
     66 
     67 ref(undefined, void 0).next();
     68 
     69 assert.sameValue(callCount, 1, 'generator function invoked exactly once');
     70 
     71 reportCompare(0, 0);