tor-browser

The Tor Browser
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gen-meth-dflt-ary-ptrn-rest-id-elision.js (2592B)

      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/gen-method-dflt.template
      4 /*---
      5 description: Rest element following elision elements (generator method (default parameter))
      6 esid: sec-generator-function-definitions-runtime-semantics-propertydefinitionevaluation
      7 features: [generators, destructuring-binding, default-parameters]
      8 flags: [generated]
      9 info: |
     10    GeneratorMethod :
     11        * PropertyName ( StrictFormalParameters ) { GeneratorBody }
     12 
     13    1. Let propKey be the result of evaluating PropertyName.
     14    2. ReturnIfAbrupt(propKey).
     15    3. If the function code for this GeneratorMethod is strict mode code,
     16       let strict be true. Otherwise let strict be false.
     17    4. Let scope be the running execution context's LexicalEnvironment.
     18    5. Let closure be GeneratorFunctionCreate(Method,
     19       StrictFormalParameters, GeneratorBody, scope, strict).
     20    [...]
     21 
     22    9.2.1 [[Call]] ( thisArgument, argumentsList)
     23 
     24    [...]
     25    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     26    [...]
     27 
     28    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     29 
     30    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     31    [...]
     32 
     33    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     34 
     35    [...]
     36    23. Let iteratorRecord be Record {[[iterator]]:
     37        CreateListIterator(argumentsList), [[done]]: false}.
     38    24. If hasDuplicates is true, then
     39        [...]
     40    25. Else,
     41        b. Let formalStatus be IteratorBindingInitialization for formals with
     42           iteratorRecord and env as arguments.
     43    [...]
     44 
     45    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     46    ArrayBindingPattern : [ Elisionopt BindingRestElement ]
     47    1. If Elision is present, then
     48       a. Let status be the result of performing
     49          IteratorDestructuringAssignmentEvaluation of Elision with
     50          iteratorRecord as the argument.
     51       b. ReturnIfAbrupt(status).
     52    2. Return the result of performing IteratorBindingInitialization for
     53       BindingRestElement with iteratorRecord and environment as arguments.
     54 ---*/
     55 var values = [1, 2, 3, 4, 5];
     56 
     57 var callCount = 0;
     58 var obj = {
     59  *method([ , , ...x] = values) {
     60    assert(Array.isArray(x));
     61    assert.sameValue(x.length, 3);
     62    assert.sameValue(x[0], 3);
     63    assert.sameValue(x[1], 4);
     64    assert.sameValue(x[2], 5);
     65    assert.notSameValue(x, values);
     66    callCount = callCount + 1;
     67  }
     68 };
     69 
     70 obj.method().next();
     71 assert.sameValue(callCount, 1, 'generator method invoked exactly once');
     72 
     73 reportCompare(0, 0);