tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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meth-dflt-ary-ptrn-rest-id-elision.js (2969B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-rest-id-elision.case
      3 // - src/dstr-binding/default/cls-decl-meth-dflt.template
      4 /*---
      5 description: Rest element following elision elements (class expression method (default parameter))
      6 esid: sec-runtime-semantics-bindingclassdeclarationevaluation
      7 features: [destructuring-binding, 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    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     60    ArrayBindingPattern : [ Elisionopt BindingRestElement ]
     61    1. If Elision is present, then
     62       a. Let status be the result of performing
     63          IteratorDestructuringAssignmentEvaluation of Elision with
     64          iteratorRecord as the argument.
     65       b. ReturnIfAbrupt(status).
     66    2. Return the result of performing IteratorBindingInitialization for
     67       BindingRestElement with iteratorRecord and environment as arguments.
     68 ---*/
     69 var values = [1, 2, 3, 4, 5];
     70 
     71 var callCount = 0;
     72 class C {
     73  method([ , , ...x] = values) {
     74    assert(Array.isArray(x));
     75    assert.sameValue(x.length, 3);
     76    assert.sameValue(x[0], 3);
     77    assert.sameValue(x[1], 4);
     78    assert.sameValue(x[2], 5);
     79    assert.notSameValue(x, values);
     80    callCount = callCount + 1;
     81  }
     82 };
     83 
     84 new C().method();
     85 assert.sameValue(callCount, 1, 'method invoked exactly once');
     86 
     87 reportCompare(0, 0);