tor-browser

The Tor Browser
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array-elem-iter-nrml-close.js (2271B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-elem-iter-nrml-close.case
      3 // - src/dstr-assignment/default/for-of.template
      4 /*---
      5 description: IteratorClose is called when assignment evaluation has not exhausted 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 : [ AssignmentElementList ]
     28 
     29    [...]
     30    5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
     31       result).
     32    6. Return result.
     33 
     34    7.4.6 IteratorClose( iterator, completion )
     35 
     36    [...]
     37    6. Let innerResult be Call(return, iterator, « »).
     38    [...]
     39 
     40 ---*/
     41 var nextCount = 0;
     42 var returnCount = 0;
     43 var thisValue = null;
     44 var args = null;
     45 var _;
     46 var iterable = {};
     47 var iterator = {
     48  next: function() {
     49    nextCount += 1;
     50    // Set an upper-bound to limit unnecessary iteration in non-conformant
     51    // implementations
     52    return { done: nextCount > 10 };
     53  },
     54  return: function() {
     55    returnCount += 1;
     56    thisValue = this;
     57    args = arguments;
     58    return {};
     59  }
     60 };
     61 iterable[Symbol.iterator] = function() {
     62  return iterator;
     63 };
     64 
     65 var counter = 0;
     66 
     67 for ([ _ ] of [iterable]) {
     68  assert.sameValue(nextCount, 1);
     69  assert.sameValue(returnCount, 1);
     70  assert.sameValue(thisValue, iterator, 'correct `this` value');
     71  assert(!!args, 'arguments object provided');
     72  assert.sameValue(args.length, 0, 'zero arguments specified');
     73  counter += 1;
     74 }
     75 
     76 assert.sameValue(counter, 1);
     77 
     78 reportCompare(0, 0);