Run results for: indexOf: compare to -1 or use ~

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; Touch; rv:11.0) like Gecko

Browser: IE 11

Operating system: Windows

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
Compare to -1	1241474.9 Ops/sec
Use tilde	1254449.9 Ops/sec

Script Preparation code:

var constants = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'.split('');
var findable = 'A';
var unfindable = '0';

Tests:

Compare to -1
if (constants.indexOf(findable) !== -1) { var A = true; } if (constants.indexOf(unfindable) !== -1) { var O = true; }
Use tilde
if (~constants.indexOf(findable)) { var A = true; } if (~constants.indexOf(unfindable)) { var O = true; }