tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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ary-ptrn-elem-ary-elision-init.js (2149B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-elem-ary-elision-init.case
      3 // - src/dstr-binding/default/func-decl.template
      4 /*---
      5 description: BindingElement with array binding pattern and initializer is used (function declaration)
      6 esid: sec-function-definitions-runtime-semantics-instantiatefunctionobject
      7 features: [generators, destructuring-binding]
      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    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     42 
     43    BindingElement : BindingPatternInitializer opt
     44 
     45    [...]
     46    2. If iteratorRecord.[[done]] is true, let v be undefined.
     47    3. If Initializer is present and v is undefined, then
     48       a. Let defaultValue be the result of evaluating Initializer.
     49       b. Let v be ? GetValue(defaultValue).
     50    4. Return the result of performing BindingInitialization of BindingPattern
     51       with v and environment as the arguments.
     52 
     53 ---*/
     54 var first = 0;
     55 var second = 0;
     56 function* g() {
     57  first += 1;
     58  yield;
     59  second += 1;
     60 };
     61 
     62 var callCount = 0;
     63 function f([[,] = g()]) {
     64  assert.sameValue(first, 1);
     65  assert.sameValue(second, 0);
     66  callCount = callCount + 1;
     67 };
     68 f([]);
     69 assert.sameValue(callCount, 1, 'function invoked exactly once');
     70 
     71 reportCompare(0, 0);