Run results for: JS string includes vs indexOf

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

String.prototype.includes

142.0M/s

String.prototype.indexOf

137.6M/s

View exact numbers

Test name	Executions per second
✓ String.prototype.includes	142,047,616 Ops/sec
String.prototype.indexOf	137,592,752 Ops/sec

Script Preparation code:

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

Tests: