tor-browser

The Tor Browser
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dflt-obj-ptrn-prop-id-init-skipped.js (2279B)

      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/func-decl-dflt.template
      4 /*---
      5 description: Destructuring initializer is not evaluated when value is not `undefined` (function declaration (default parameter))
      6 esid: sec-function-definitions-runtime-semantics-instantiatefunctionobject
      7 features: [destructuring-binding, default-parameters]
      8 flags: [generated]
      9 info: |
     10    FunctionDeclaration :
     11        function BindingIdentifier ( FormalParameters ) { FunctionBody }
     12 
     13        [...]
     14        3. Let F be FunctionCreate(Normal, FormalParameters, FunctionBody,
     15           scope, strict).
     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    13.3.3.7 Runtime Semantics: KeyedBindingInitialization
     42 
     43    BindingElement : BindingPattern Initializeropt
     44 
     45    [...]
     46    3. If Initializer is present and v is undefined, then
     47    [...]
     48 ---*/
     49 var initCount = 0;
     50 function counter() {
     51  initCount += 1;
     52 }
     53 
     54 var callCount = 0;
     55 function f({ s: t = counter(), u: v = counter(), w: x = counter(), y: z = counter() } = { s: null, u: 0, w: false, y: '' }) {
     56  assert.sameValue(t, null);
     57  assert.sameValue(v, 0);
     58  assert.sameValue(x, false);
     59  assert.sameValue(z, '');
     60  assert.sameValue(initCount, 0);
     61 
     62  assert.throws(ReferenceError, function() {
     63    s;
     64  });
     65  assert.throws(ReferenceError, function() {
     66    u;
     67  });
     68  assert.throws(ReferenceError, function() {
     69    w;
     70  });
     71  assert.throws(ReferenceError, function() {
     72    y;
     73  });
     74  callCount = callCount + 1;
     75 };
     76 f();
     77 assert.sameValue(callCount, 1, 'function invoked exactly once');
     78 
     79 reportCompare(0, 0);