tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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params-dflt-meth-ref-arguments.js (2214B)

      1 // Copyright (C) 2016 the V8 project authors. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 /*---
      4 description: Referencing the arguments object from a default parameter (method)
      5 esid: sec-runtime-semantics-definemethod
      6 es6id: 14.3.8
      7 features: [default-parameters]
      8 info: |
      9    MethodDefinition : PropertyName ( StrictFormalParameters ) { FunctionBody }
     10 
     11    [...]
     12    6. Let closure be FunctionCreate(kind, StrictFormalParameters,
     13       FunctionBody, scope, strict). If functionPrototype was passed as a
     14       parameter then pass its value as the functionPrototype optional argument
     15       of FunctionCreate.
     16    [...]
     17 
     18    9.2.1 [[Call]] ( thisArgument, argumentsList)
     19 
     20    [...]
     21    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     22    [...]
     23 
     24    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     25 
     26    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     27    [...]
     28 
     29    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     30 
     31    [...]
     32    23. Let iteratorRecord be Record {[[iterator]]:
     33        CreateListIterator(argumentsList), [[done]]: false}.
     34    24. If hasDuplicates is true, then
     35        [...]
     36    25. Else,
     37        b. Let formalStatus be IteratorBindingInitialization for formals with
     38           iteratorRecord and env as arguments.
     39    [...]
     40 
     41    14.1.19 Runtime Semantics: IteratorBindingInitialization
     42 
     43    FormalsList : FormalsList , FormalParameter
     44 
     45    1. Let status be the result of performing IteratorBindingInitialization for
     46       FormalsList using iteratorRecord and environment as the arguments.
     47    2. ReturnIfAbrupt(status).
     48    3. Return the result of performing IteratorBindingInitialization for
     49       FormalParameter using iteratorRecord and environment as the arguments.
     50 ---*/
     51 
     52 var callCount = 0;
     53 var obj = {
     54  method(x = arguments[2], y = arguments[3], z) {
     55    assert.sameValue(x, 'third', 'first parameter');
     56    assert.sameValue(y, 'fourth', 'second parameter');
     57    assert.sameValue(z, 'third', 'third parameter');
     58    callCount = callCount + 1;
     59  }
     60 };
     61 
     62 obj.method(undefined, undefined, 'third', 'fourth');
     63 
     64 assert.sameValue(callCount, 1, 'method invoked exactly once');
     65 
     66 reportCompare(0, 0);