tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-ary-ptrn-elem-ary-empty-init.js (2212B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-elem-ary-empty-init.case
      3 // - src/dstr-binding/default/func-expr-dflt.template
      4 /*---
      5 description: BindingElement with array binding pattern and initializer is used (function expression (default parameter))
      6 esid: sec-function-definitions-runtime-semantics-evaluation
      7 features: [generators, destructuring-binding, default-parameters]
      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    BindingElement : BindingPatternInitializer opt
     43 
     44    [...]
     45    2. If iteratorRecord.[[done]] is true, let v be undefined.
     46    3. If Initializer is present and v is undefined, then
     47       a. Let defaultValue be the result of evaluating Initializer.
     48       b. Let v be ? GetValue(defaultValue).
     49    4. Return the result of performing BindingInitialization of BindingPattern
     50       with v and environment as the arguments.
     51 
     52 ---*/
     53 var initCount = 0;
     54 var iterCount = 0;
     55 var iter = function*() { iterCount += 1; }();
     56 
     57 var callCount = 0;
     58 var f;
     59 f = function([[] = function() { initCount += 1; return iter; }()] = []) {
     60  assert.sameValue(initCount, 1);
     61  assert.sameValue(iterCount, 0);
     62  callCount = callCount + 1;
     63 };
     64 
     65 f();
     66 assert.sameValue(callCount, 1, 'function invoked exactly once');
     67 
     68 reportCompare(0, 0);