tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

create-value.js (949B)

      1 // Copyright (C) 2016 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-symbol.for
      5 description: Creation of a unique Symbol value
      6 info: |
      7    1. Let stringKey be ? ToString(key).
      8    2. For each element e of the GlobalSymbolRegistry List,
      9       a. If SameValue(e.[[Key]], stringKey) is true, return e.[[Symbol]].
     10    3. Assert: GlobalSymbolRegistry does not currently contain an entry for
     11       stringKey.
     12    4. Let newSymbol be a new unique Symbol value whose [[Description]] value
     13       is stringKey.
     14    5. Append the Record { [[Key]]: stringKey, [[Symbol]]: newSymbol } to the
     15       GlobalSymbolRegistry List.
     16    6. Return newSymbol. 
     17 features: [Symbol]
     18 ---*/
     19 
     20 var canonical = Symbol.for('s');
     21 
     22 assert.sameValue(typeof canonical, 'symbol');
     23 assert.notSameValue(canonical, Symbol('s'));
     24 assert.notSameValue(canonical, Symbol.for('y'));
     25 
     26 reportCompare(0, 0);