tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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meth-ary-ptrn-rest-id-elision.js (2285B)

      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/meth.template
      4 /*---
      5 description: Rest element following elision elements (method)
      6 esid: sec-runtime-semantics-definemethod
      7 features: [destructuring-binding]
      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    ArrayBindingPattern : [ Elisionopt BindingRestElement ]
     44    1. If Elision is present, then
     45       a. Let status be the result of performing
     46          IteratorDestructuringAssignmentEvaluation of Elision with
     47          iteratorRecord as the argument.
     48       b. ReturnIfAbrupt(status).
     49    2. Return the result of performing IteratorBindingInitialization for
     50       BindingRestElement with iteratorRecord and environment as arguments.
     51 ---*/
     52 var values = [1, 2, 3, 4, 5];
     53 
     54 var callCount = 0;
     55 var obj = {
     56  method([ , , ...x]) {
     57    assert(Array.isArray(x));
     58    assert.sameValue(x.length, 3);
     59    assert.sameValue(x[0], 3);
     60    assert.sameValue(x[1], 4);
     61    assert.sameValue(x[2], 5);
     62    assert.notSameValue(x, values);
     63    callCount = callCount + 1;
     64  }
     65 };
     66 
     67 obj.method(values);
     68 assert.sameValue(callCount, 1, 'method invoked exactly once');
     69 
     70 reportCompare(0, 0);