tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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const-ary-ptrn-elem-ary-elision-init.js (2107B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-binding/ary-ptrn-elem-ary-elision-init.case
      3 // - src/dstr-binding/default/for-of-const.template
      4 /*---
      5 description: BindingElement with array binding pattern and initializer is used (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    BindingElement : BindingPatternInitializer opt
     41 
     42    [...]
     43    2. If iteratorRecord.[[done]] is true, let v be undefined.
     44    3. If Initializer is present and v is undefined, then
     45       a. Let defaultValue be the result of evaluating Initializer.
     46       b. Let v be ? GetValue(defaultValue).
     47    4. Return the result of performing BindingInitialization of BindingPattern
     48       with v and environment as the arguments.
     49 
     50 ---*/
     51 var first = 0;
     52 var second = 0;
     53 function* g() {
     54  first += 1;
     55  yield;
     56  second += 1;
     57 };
     58 
     59 var iterCount = 0;
     60 
     61 for (const [[,] = g()] of [[]]) {
     62  assert.sameValue(first, 1);
     63  assert.sameValue(second, 0);
     64 
     65  iterCount += 1;
     66 }
     67 
     68 assert.sameValue(iterCount, 1, 'iteration occurred as expected');
     69 
     70 reportCompare(0, 0);