tor-browser

The Tor Browser
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meth-dflt-obj-ptrn-rest-skip-non-enumerable.js (2051B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/obj-ptrn-rest-skip-non-enumerable.case
      3 // - src/dstr-binding/default/meth-dflt.template
      4 /*---
      5 description: Rest object doesn't contain non-enumerable properties (method (default parameter))
      6 esid: sec-runtime-semantics-definemethod
      7 features: [object-rest, destructuring-binding, default-parameters]
      8 flags: [generated]
      9 includes: [propertyHelper.js]
     10 info: |
     11    MethodDefinition : PropertyName ( StrictFormalParameters ) { FunctionBody }
     12 
     13    [...]
     14    6. Let closure be FunctionCreate(kind, StrictFormalParameters,
     15       FunctionBody, scope, strict). If functionPrototype was passed as a
     16       parameter then pass its value as the functionPrototype optional argument
     17       of FunctionCreate.
     18    [...]
     19 
     20    9.2.1 [[Call]] ( thisArgument, argumentsList)
     21 
     22    [...]
     23    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     24    [...]
     25 
     26    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     27 
     28    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     29    [...]
     30 
     31    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     32 
     33    [...]
     34    23. Let iteratorRecord be Record {[[iterator]]:
     35        CreateListIterator(argumentsList), [[done]]: false}.
     36    24. If hasDuplicates is true, then
     37        [...]
     38    25. Else,
     39        b. Let formalStatus be IteratorBindingInitialization for formals with
     40           iteratorRecord and env as arguments.
     41    [...]
     42 ---*/
     43 var o = {a: 3, b: 4};
     44 Object.defineProperty(o, "x", { value: 4, enumerable: false });
     45 
     46 var callCount = 0;
     47 var obj = {
     48  method({...rest} = o) {
     49    assert.sameValue(rest.x, undefined);
     50 
     51    verifyProperty(rest, "a", {
     52      enumerable: true,
     53      writable: true,
     54      configurable: true,
     55      value: 3
     56    });
     57 
     58    verifyProperty(rest, "b", {
     59      enumerable: true,
     60      writable: true,
     61      configurable: true,
     62      value: 4
     63    });
     64    callCount = callCount + 1;
     65  }
     66 };
     67 
     68 obj.method();
     69 assert.sameValue(callCount, 1, 'method invoked exactly once');
     70 
     71 reportCompare(0, 0);