tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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ary-ptrn-elem-id-init-skipped.js (2067B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-elem-id-init-skipped.case
      3 // - src/dstr-binding/default/func-expr.template
      4 /*---
      5 description: Destructuring initializer is not evaluated when value is not `undefined` (function expression)
      6 esid: sec-function-definitions-runtime-semantics-evaluation
      7 features: [destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    FunctionExpression : function ( FormalParameters ) { FunctionBody }
     11 
     12        [...]
     13        3. Let closure be FunctionCreate(Normal, FormalParameters, FunctionBody,
     14           scope, strict).
     15        [...]
     16 
     17    9.2.1 [[Call]] ( thisArgument, argumentsList)
     18 
     19    [...]
     20    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     21    [...]
     22 
     23    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     24 
     25    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     26    [...]
     27 
     28    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     29 
     30    [...]
     31    23. Let iteratorRecord be Record {[[iterator]]:
     32        CreateListIterator(argumentsList), [[done]]: false}.
     33    24. If hasDuplicates is true, then
     34        [...]
     35    25. Else,
     36        b. Let formalStatus be IteratorBindingInitialization for formals with
     37           iteratorRecord and env as arguments.
     38    [...]
     39 
     40    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     41 
     42    SingleNameBinding : BindingIdentifier Initializeropt
     43 
     44    [...]
     45    6. If Initializer is present and v is undefined, then
     46       [...]
     47    7. If environment is undefined, return PutValue(lhs, v).
     48    8. Return InitializeReferencedBinding(lhs, v).
     49 ---*/
     50 var initCount = 0;
     51 function counter() {
     52  initCount += 1;
     53 }
     54 
     55 var callCount = 0;
     56 var f;
     57 f = function([w = counter(), x = counter(), y = counter(), z = counter()]) {
     58  assert.sameValue(w, null);
     59  assert.sameValue(x, 0);
     60  assert.sameValue(y, false);
     61  assert.sameValue(z, '');
     62  assert.sameValue(initCount, 0);
     63  callCount = callCount + 1;
     64 };
     65 
     66 f([null, 0, false, '']);
     67 assert.sameValue(callCount, 1, 'function invoked exactly once');
     68 
     69 reportCompare(0, 0);