Run results for: JS string includes vs indexOf

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Windows

Device Platform: Desktop

Date tested: one month ago

Test name	Executions per second
String.prototype.includes	500115808.0 Ops/sec
String.prototype.indexOf	503111488.0 Ops/sec

Script Preparation code:

var str = '';
var i = 0;

while (i <= 1E5) str += i++;
str += 'end';

​x
 
var str = '';var i = 0;​while (i <= 1E5) str += i++;str += 'end';

Tests:

String.prototype.includes
const item = str.includes('end');
const item = str.includes('end');
String.prototype.indexOf
const index = str.indexOf('end');
const index = str.indexOf('end');