tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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let-ary-ptrn-rest-ary-empty.js (2060B)

      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/for-of-let.template
      4 /*---
      5 description: Rest element containing an "empty" array pattern (for-of statement)
      6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
      7 features: [generators, destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    IterationStatement :
     11        for ( ForDeclaration of AssignmentExpression ) Statement
     12 
     13    [...]
     14    3. Return ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult,
     15       lexicalBinding, labelSet).
     16 
     17    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
     18 
     19    [...]
     20    3. Let destructuring be IsDestructuring of lhs.
     21    [...]
     22    5. Repeat
     23       [...]
     24       h. If destructuring is false, then
     25          [...]
     26       i. Else
     27          i. If lhsKind is assignment, then
     28             [...]
     29          ii. Else if lhsKind is varBinding, then
     30              [...]
     31          iii. Else,
     32               1. Assert: lhsKind is lexicalBinding.
     33               2. Assert: lhs is a ForDeclaration.
     34               3. Let status be the result of performing BindingInitialization
     35                  for lhs passing nextValue and iterationEnv as arguments.
     36          [...]
     37 
     38    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     39 
     40    BindingRestElement : ... BindingPattern
     41 
     42    1. Let A be ArrayCreate(0).
     43    [...]
     44    3. Repeat
     45       [...]
     46       b. If iteratorRecord.[[done]] is true, then
     47          i. Return the result of performing BindingInitialization of
     48             BindingPattern with A and environment as the arguments.
     49       [...]
     50 
     51    13.3.3.6 Runtime Semantics: IteratorBindingInitialization
     52 
     53    ArrayBindingPattern : [ ]
     54 
     55    1. Return NormalCompletion(empty).
     56 
     57 ---*/
     58 var iterations = 0;
     59 var iter = function*() {
     60  iterations += 1;
     61 }();
     62 
     63 var iterCount = 0;
     64 
     65 for (let [...[]] of [iter]) {
     66  assert.sameValue(iterations, 1);
     67 
     68  iterCount += 1;
     69 }
     70 
     71 assert.sameValue(iterCount, 1, 'Iteration occurred as expected');
     72 
     73 reportCompare(0, 0);