tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

array-elem-trlg-iter-elision-iter-nrml-close-skip.js (2096B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-elem-trlg-iter-elision-iter-nrml-close-skip.case
      3 // - src/dstr-assignment/default/for-of.template
      4 /*---
      5 description: IteratorClose not invoked when elision exhausts the iterator (For..of statement)
      6 esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
      7 features: [Symbol.iterator, destructuring-binding]
      8 flags: [generated]
      9 info: |
     10    IterationStatement :
     11      for ( LeftHandSideExpression of AssignmentExpression ) Statement
     12 
     13    1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« »,
     14       AssignmentExpression, iterate).
     15    2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
     16       keyResult, assignment, labelSet).
     17 
     18    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
     19 
     20    [...]
     21    4. If destructuring is true and if lhsKind is assignment, then
     22       a. Assert: lhs is a LeftHandSideExpression.
     23       b. Let assignmentPattern be the parse of the source text corresponding to
     24          lhs using AssignmentPattern as the goal symbol.
     25    [...]
     26 
     27    ArrayAssignmentPattern :
     28        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
     29 
     30    [...]
     31    6. If Elision is present, then
     32       a. Let status be the result of performing
     33          IteratorDestructuringAssignmentEvaluation of Elision with
     34          iteratorRecord as the argument.
     35       b. If status is an abrupt completion, then
     36          [...]
     37    8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
     38       status).
     39    9. Return Completion(status).
     40 
     41 ---*/
     42 var nextCount = 0;
     43 var returnCount = 0;
     44 var iterable = {};
     45 var x;
     46 var iterator = {
     47  next: function() {
     48    nextCount += 1;
     49 
     50    return { done: nextCount > 1 };
     51  },
     52  return: function() {
     53    returnCount += 1;
     54  }
     55 };
     56 iterable[Symbol.iterator] = function() {
     57  return iterator;
     58 };
     59 
     60 var counter = 0;
     61 
     62 for ([ x , , ] of [iterable]) {
     63  assert.sameValue(nextCount, 2);
     64  assert.sameValue(returnCount, 0);
     65  counter += 1;
     66 }
     67 
     68 assert.sameValue(counter, 1);
     69 
     70 reportCompare(0, 0);