Run results for: string split vs indexOf iteration

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:125.0) Gecko/20100101 Firefox/125.0

Browser: Firefox 125

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

split

67/s

indexOf walk

57/s

View exact numbers

Test name	Executions per second
✓ split	67 Ops/sec
indexOf walk	57 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); }