Run results for: index vs lastindexof

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.1

Device Platform: Mobile

Date tested: one year ago

indexOf

491.7M/s

lastIndexOf

33.2M/s

View exact numbers

Test name	Executions per second
✓ indexOf	491,699,616 Ops/sec
lastIndexOf	33,232,564 Ops/sec

Tests:

lastIndexOf
var str = "Hello world, welcome to the universe."; var n = str.lastIndexOf("welcome");
indexOf
var str = "Hello world, welcome to the universe."; var n = str.indexOf("welcome");