tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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dflt-ary-ptrn-rest-ary-empty.js (2127B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-rest-ary-empty.case
      3 // - src/dstr-binding/default/func-expr-dflt.template
      4 /*---
      5 description: Rest element containing an "empty" array pattern (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    BindingRestElement : ... BindingPattern
     43 
     44    1. Let A be ArrayCreate(0).
     45    [...]
     46    3. Repeat
     47       [...]
     48       b. If iteratorRecord.[[done]] is true, then
     49          i. Return the result of performing BindingInitialization of
     50             BindingPattern with A and environment as the arguments.
     51       [...]
     52 
     53    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     54 
     55    ArrayBindingPattern : [ ]
     56 
     57    1. Return NormalCompletion(empty).
     58 
     59 ---*/
     60 var iterations = 0;
     61 var iter = function*() {
     62  iterations += 1;
     63 }();
     64 
     65 var callCount = 0;
     66 var f;
     67 f = function([...[]] = iter) {
     68  assert.sameValue(iterations, 1);
     69  callCount = callCount + 1;
     70 };
     71 
     72 f();
     73 assert.sameValue(callCount, 1, 'function invoked exactly once');
     74 
     75 reportCompare(0, 0);