Run results for: Javascript: Case insensitive string comparison indexOf vs includes 2

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 27_0_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/150.0.7871.113 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 150

Operating system: iOS 27.0.0

Device Platform: Mobile

Date tested: 22 days ago

Regex_indexOf

264K/s

toLowerCase_includes

34K/s

View exact numbers

Test name	Executions per second
✓ Regex_indexOf	263,919 Ops/sec
toLowerCase_includes	34,013 Ops/sec

Script Preparation code:

var words = Array.from({ length: 1000 }, (_, i) => `word${i + 1}`);
var searchString = "WORD512";
var searchStringRegex = new RegExp(searchString, 'i');

Tests:

toLowerCase_includes
const filteredCase1 = words.filter(word => word.toLowerCase().includes(searchString.toLowerCase()));
Regex_indexOf
const filteredCase2 = words.filter(word => searchStringRegex.test(word));