tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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empty-iterable.js (808B)

      1 // Copyright (C) 2015 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-weakmap-iterable
      5 description: >
      6  If the iterable argument is empty, return new WeakMap object.
      7 info: |
      8  23.3.1.1 WeakMap ( [ iterable ] )
      9 
     10  ...
     11  9. Repeat
     12    a. Let next be IteratorStep(iter).
     13    b. ReturnIfAbrupt(next).
     14    c. If next is false, return map.
     15  ...
     16 ---*/
     17 
     18 var counter = 0;
     19 var set = WeakMap.prototype.set;
     20 WeakMap.prototype.set = function(value) {
     21  counter++;
     22  return set.call(this, value);
     23 };
     24 var map = new WeakMap([]);
     25 
     26 assert.sameValue(Object.getPrototypeOf(map), WeakMap.prototype);
     27 assert(map instanceof WeakMap);
     28 assert.sameValue(
     29  counter, 0,
     30  'empty iterable does not call WeakMap.prototype.set'
     31 );
     32 
     33 reportCompare(0, 0);