Run results for: string split vs indexOf vs yield

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

63/s

indexOf

57/s

yield

16/s

View exact numbers

Script Preparation code:

var str = "123 ".repeat(1000000)

Tests:

split
var split = str.split(" ") var count = 0; for (const s of split) count++;
indexOf
var count = 0; var i = 0; while (i >= 0) { count++; i = str.indexOf(" ", i + 1); }
yield
function* splitIter(str, needle) { let i = 0; while (i >= 0) { const iOld = i; i = str.indexOf(" ", i + 1); if (i > 0) yield str.substring(iOld, i) else if (iOld < str.length) yield str.substring(iOld) } } let count = 0 for (const s of splitIter(str, " ")) count++;