tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-ary-ptrn-elem-ary-elision-init.js (2136B)

      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/arrow-function-dflt.template
      4 /*---
      5 description: BindingElement with array binding pattern and initializer is used (arrow function expression (default parameter))
      6 esid: sec-arrow-function-definitions-runtime-semantics-evaluation
      7 features: [generators, destructuring-binding, default-parameters]
      8 flags: [generated]
      9 info: |
     10    ArrowFunction : ArrowParameters => ConciseBody
     11 
     12    [...]
     13    4. Let closure be FunctionCreate(Arrow, parameters, ConciseBody, scope, strict).
     14    [...]
     15 
     16    9.2.1 [[Call]] ( thisArgument, argumentsList)
     17 
     18    [...]
     19    7. Let result be OrdinaryCallEvaluateBody(F, argumentsList).
     20    [...]
     21 
     22    9.2.1.3 OrdinaryCallEvaluateBody ( F, argumentsList )
     23 
     24    1. Let status be FunctionDeclarationInstantiation(F, argumentsList).
     25    [...]
     26 
     27    9.2.12 FunctionDeclarationInstantiation(func, argumentsList)
     28 
     29    [...]
     30    23. Let iteratorRecord be Record {[[iterator]]:
     31        CreateListIterator(argumentsList), [[done]]: false}.
     32    24. If hasDuplicates is true, then
     33        [...]
     34    25. Else,
     35        b. Let formalStatus be IteratorBindingInitialization for formals with
     36           iteratorRecord and env as arguments.
     37    [...]
     38 
     39    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     40 
     41    BindingElement : BindingPatternInitializer opt
     42 
     43    [...]
     44    2. If iteratorRecord.[[done]] is true, let v be undefined.
     45    3. If Initializer is present and v is undefined, then
     46       a. Let defaultValue be the result of evaluating Initializer.
     47       b. Let v be ? GetValue(defaultValue).
     48    4. Return the result of performing BindingInitialization of BindingPattern
     49       with v and environment as the arguments.
     50 
     51 ---*/
     52 var first = 0;
     53 var second = 0;
     54 function* g() {
     55  first += 1;
     56  yield;
     57  second += 1;
     58 };
     59 
     60 var callCount = 0;
     61 var f;
     62 f = ([[,] = g()] = []) => {
     63  assert.sameValue(first, 1);
     64  assert.sameValue(second, 0);
     65  callCount = callCount + 1;
     66 };
     67 
     68 f();
     69 assert.sameValue(callCount, 1, 'arrow function invoked exactly once');
     70 
     71 reportCompare(0, 0);