Run results for: string split vs indexOf iteration

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser: Chrome 138

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

indexOf walk

146/s

split

25/s

View exact numbers

Test name	Executions per second
✓ indexOf walk	146 Ops/sec
split	25 Ops/sec

Script Preparation code:

var str = "123 ".repeat(1000000)

Tests:

split
var split = str.split(" ") var count = 0; for (const s of split) count++;
indexOf walk
var count = 0; var i = 0; while (i >= 0) { count++; i = str.indexOf(" ", i + 1); }