tor-browser

The Tor Browser
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const-ary-ptrn-rest-ary-elem.js (2664B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-rest-ary-elem.case
      3 // - src/dstr-binding/default/for-of-const.template
      4 /*---
      5 description: Rest element containing an array BindingElementList pattern (for-of statement)
      6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
      7 features: [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    SingleNameBinding : BindingIdentifier Initializeropt
     54 
     55    [...]
     56    4. If iteratorRecord.[[done]] is false, then
     57       a. Let next be IteratorStep(iteratorRecord.[[iterator]]).
     58       b. If next is an abrupt completion, set iteratorRecord.[[done]] to true.
     59       c. ReturnIfAbrupt(next).
     60       d. If next is false, set iteratorRecord.[[done]] to true.
     61       e. Else,
     62          [...]
     63          i. Let v be IteratorValue(next).
     64          ii. If v is an abrupt completion, set
     65              iteratorRecord.[[done]] to true.
     66          iii. ReturnIfAbrupt(v).
     67    5. If iteratorRecord.[[done]] is true, let v be undefined.
     68    [...]
     69    8. Return InitializeReferencedBinding(lhs, v).
     70 ---*/
     71 
     72 var iterCount = 0;
     73 
     74 for (const [...[x, y, z]] of [[3, 4, 5]]) {
     75  assert.sameValue(x, 3);
     76  assert.sameValue(y, 4);
     77  assert.sameValue(z, 5);
     78 
     79  iterCount += 1;
     80 }
     81 
     82 assert.sameValue(iterCount, 1, 'iteration occurred as expected');
     83 
     84 reportCompare(0, 0);