tor-browser

The Tor Browser
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bigint-number-same-value.js (1047B)

      1 // Copyright (C) 2021 Rick Waldron. All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 /*---
      4 esid: sec-set.prototype.add
      5 description: >
      6  Observing the expected behavior of keys when a BigInt and Number have
      7  the same value.
      8 info: |
      9  Set.prototype.add ( value )
     10 
     11  ...
     12  For each element e of entries, do
     13    If e is not empty and SameValueZero(e, value) is true, then
     14    Return S.
     15  If value is -0, set value to +0.
     16  Append value as the last element of entries.
     17  ...
     18 
     19 features: [BigInt]
     20 ---*/
     21 
     22 const number = 9007199254740991;
     23 const bigint = 9007199254740991n;
     24 
     25 const s = new Set([
     26  number,
     27  bigint,
     28 ]);
     29 
     30 assert.sameValue(s.size, 2);
     31 assert.sameValue(s.has(number), true);
     32 assert.sameValue(s.has(bigint), true);
     33 
     34 s.delete(number);
     35 assert.sameValue(s.size, 1);
     36 assert.sameValue(s.has(number), false);
     37 s.delete(bigint);
     38 assert.sameValue(s.size, 0);
     39 assert.sameValue(s.has(bigint), false);
     40 
     41 s.add(number);
     42 assert.sameValue(s.size, 1);
     43 s.add(bigint);
     44 assert.sameValue(s.size, 2);
     45 
     46 reportCompare(0, 0);