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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Regex_indexOf

39K/s

toLowerCase_includes

31K/s

View exact numbers

Test name	Executions per second
✓ Regex_indexOf	39,338 Ops/sec
toLowerCase_includes	31,322 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));