tor-browser

The Tor Browser
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let-ary-ptrn-rest-ary-elem.js (2707B)

      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-let.template
      4 /*---
      5 description: Rest element containing an array BindingElementList pattern (for statement)
      6 esid: sec-for-statement-runtime-semantics-labelledevaluation
      7 features: [destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    IterationStatement :
     11        for ( LexicalDeclaration Expressionopt ; Expressionopt ) Statement
     12 
     13    [...]
     14    7. Let forDcl be the result of evaluating LexicalDeclaration.
     15    [...]
     16 
     17    LexicalDeclaration : LetOrConst BindingList ;
     18 
     19    1. Let next be the result of evaluating BindingList.
     20    2. ReturnIfAbrupt(next).
     21    3. Return NormalCompletion(empty).
     22 
     23    BindingList : BindingList , LexicalBinding
     24 
     25    1. Let next be the result of evaluating BindingList.
     26    2. ReturnIfAbrupt(next).
     27    3. Return the result of evaluating LexicalBinding.
     28 
     29    LexicalBinding : BindingPattern Initializer
     30 
     31    1. Let rhs be the result of evaluating Initializer.
     32    2. Let value be GetValue(rhs).
     33    3. ReturnIfAbrupt(value).
     34    4. Let env be the running execution context’s LexicalEnvironment.
     35    5. Return the result of performing BindingInitialization for BindingPattern
     36       using value and env as the arguments.
     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 (let [...[x, y, z]] = [3, 4, 5]; iterCount < 1; ) {
     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);