tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-ary-init-iter-close.js (2033B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-init-iter-close.case
      3 // - src/dstr-binding/default/func-decl-dflt.template
      4 /*---
      5 description: Iterator is closed when not exhausted by pattern evaluation (function declaration (default parameter))
      6 esid: sec-function-definitions-runtime-semantics-instantiatefunctionobject
      7 features: [Symbol.iterator, destructuring-binding, default-parameters]
      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    13.3.3.5 Runtime Semantics: BindingInitialization
     42 
     43    BindingPattern : ArrayBindingPattern
     44 
     45    [...]
     46    4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator,
     47       result).
     48    [...]
     49 
     50 ---*/
     51 var doneCallCount = 0;
     52 var iter = {};
     53 iter[Symbol.iterator] = function() {
     54  return {
     55    next: function() {
     56      return { value: null, done: false };
     57    },
     58    return: function() {
     59      doneCallCount += 1;
     60      return {};
     61    }
     62  };
     63 };
     64 
     65 var callCount = 0;
     66 function f([x] = iter) {
     67  assert.sameValue(doneCallCount, 1);
     68  callCount = callCount + 1;
     69 };
     70 f();
     71 assert.sameValue(callCount, 1, 'function invoked exactly once');
     72 
     73 reportCompare(0, 0);