tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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array-empty-iter-close.js (2099B)

      1 // This file was procedurally generated from the following sources:
      2 // - src/dstr-assignment/array-empty-iter-close.case
      3 // - src/dstr-assignment/default/for-of.template
      4 /*---
      5 description: Iterator is closed without iterating (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 
     29    1. Let iterator be GetIterator(value).
     30    2. ReturnIfAbrupt(iterator).
     31    3. Return IteratorClose(iterator, NormalCompletion(empty)).
     32 
     33    7.4.6 IteratorClose( iterator, completion )
     34 
     35    [...]
     36    6. Let innerResult be Call(return, iterator, « »).
     37    [...]
     38 
     39 ---*/
     40 var nextCount = 0;
     41 var returnCount = 0;
     42 var thisValue = null;
     43 var args = null;
     44 var iterable = {};
     45 var iterator = {
     46  next: function() {
     47    nextCount += 1;
     48    return { done: true };
     49  },
     50  return: function() {
     51    returnCount += 1;
     52    thisValue = this;
     53    args = arguments;
     54    return {};
     55  }
     56 };
     57 iterable[Symbol.iterator] = function() {
     58  return iterator;
     59 };
     60 
     61 var counter = 0;
     62 
     63 for ([] of [iterable]) {
     64  assert.sameValue(nextCount, 0);
     65  assert.sameValue(returnCount, 1);
     66  assert.sameValue(thisValue, iterator, 'correct `this` value');
     67  assert(!!args, 'arguments object provided');
     68  assert.sameValue(args.length, 0, 'zero arguments specified');
     69  counter += 1;
     70 }
     71 
     72 assert.sameValue(counter, 1);
     73 
     74 reportCompare(0, 0);