tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-ary-ptrn-elision.js (2258B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-elision.case
      3 // - src/dstr-binding/default/arrow-function-dflt.template
      4 /*---
      5 description: Elision advances iterator (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    ArrayBindingPattern : [ Elision ]
     42 
     43    1. Return the result of performing
     44       IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord
     45       as the argument.
     46 
     47    12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation
     48 
     49    Elision : ,
     50 
     51    1. If iteratorRecord.[[done]] is false, then
     52       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     53       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     54       c. ReturnIfAbrupt(next).
     55       d. If next is false, set iteratorRecord.[[done]] to true.
     56    2. Return NormalCompletion(empty).
     57 
     58 ---*/
     59 var first = 0;
     60 var second = 0;
     61 function* g() {
     62  first += 1;
     63  yield;
     64  second += 1;
     65 };
     66 
     67 var callCount = 0;
     68 var f;
     69 f = ([,] = g()) => {
     70  assert.sameValue(first, 1);
     71  assert.sameValue(second, 0);
     72  callCount = callCount + 1;
     73 };
     74 
     75 f();
     76 assert.sameValue(callCount, 1, 'arrow function invoked exactly once');
     77 
     78 reportCompare(0, 0);