tor-browser

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

negativeZero.js (669B)

      1 // Copyright (c) 2023 Ecma International.  All rights reserved.
      2 // This code is governed by the BSD license found in the LICENSE file.
      3 
      4 /*---
      5 esid: sec-map.groupby
      6 description: Map.groupBy normalizes 0 for Map key
      7 info: |
      8  Map.groupBy ( items, callbackfn )
      9 
     10  ...
     11 
     12  GroupBy ( items, callbackfn, coercion )
     13 
     14  6. Repeat,
     15    h. Else,
     16      i. Assert: coercion is zero.
     17      ii. If key is -0𝔽, set key to +0𝔽.
     18 
     19  ...
     20 includes: [compareArray.js]
     21 features: [array-grouping, Map]
     22 ---*/
     23 
     24 
     25 const arr = [-0, +0];
     26 
     27 const map = Map.groupBy(arr, function (i) { return i; });
     28 
     29 assert.sameValue(map.size, 1);
     30 assert.compareArray(map.get(0), [-0, 0]);
     31 
     32 reportCompare(0, 0);