tor-browser

The Tor Browser
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meth-dflt-obj-ptrn-prop-id-init-skipped.js (2402B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/obj-ptrn-prop-id-init-skipped.case
      3 // - src/dstr-binding/default/meth-dflt.template
      4 /*---
      5 description: Destructuring initializer is not evaluated when value is not `undefined` (method (default parameter))
      6 esid: sec-runtime-semantics-definemethod
      7 features: [destructuring-binding, default-parameters]
      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    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
     43 
     44    BindingElement : BindingPattern Initializeropt
     45 
     46    [...]
     47    3. If Initializer is present and v is undefined, then
     48    [...]
     49 ---*/
     50 var initCount = 0;
     51 function counter() {
     52  initCount += 1;
     53 }
     54 
     55 var callCount = 0;
     56 var obj = {
     57  method({ s: t = counter(), u: v = counter(), w: x = counter(), y: z = counter() } = { s: null, u: 0, w: false, y: '' }) {
     58    assert.sameValue(t, null);
     59    assert.sameValue(v, 0);
     60    assert.sameValue(x, false);
     61    assert.sameValue(z, '');
     62    assert.sameValue(initCount, 0);
     63 
     64    assert.throws(ReferenceError, function() {
     65      s;
     66    });
     67    assert.throws(ReferenceError, function() {
     68      u;
     69    });
     70    assert.throws(ReferenceError, function() {
     71      w;
     72    });
     73    assert.throws(ReferenceError, function() {
     74      y;
     75    });
     76    callCount = callCount + 1;
     77  }
     78 };
     79 
     80 obj.method();
     81 assert.sameValue(callCount, 1, 'method invoked exactly once');
     82 
     83 reportCompare(0, 0);