tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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iterator-next-reference.js (1085B)

      1 // Copyright (C) 2013 the V8 project authors. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 /*---
      4 esid: sec-getiterator
      5 description: >
      6    The iterator's `next` method should be accessed only once with each
      7    iteration as per the `GetIterator` abstract operation (7.4.1).
      8 features: [Symbol.iterator, for-of]
      9 ---*/
     10 
     11 var iterable = {};
     12 var iterator = {};
     13 var iterationCount = 0;
     14 var loadNextCount = 0;
     15 
     16 iterable[Symbol.iterator] = function() {
     17  return iterator;
     18 };
     19 
     20 function next() {
     21  if (iterationCount) return { done: true };
     22  return { value: 45, done: false };
     23 }
     24 Object.defineProperty(iterator, 'next', {
     25  get() { loadNextCount++; return next; },
     26  configurable: true
     27 });
     28 
     29 for (var x of iterable) {
     30  assert.sameValue(x, 45);
     31 
     32  Object.defineProperty(iterator, 'next', {
     33    get: function() {
     34      throw new Test262Error(
     35          'Should not access the `next` method after the iteration prologue.');
     36    }
     37  });
     38  iterationCount++;
     39 }
     40 assert.sameValue(iterationCount, 1);
     41 assert.sameValue(loadNextCount, 1);
     42 
     43 reportCompare(0, 0);