Run results for: index vs lastindexof startsWith

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:63.0) Gecko/20100101 Firefox/63.0

Browser: Firefox 63

Operating system: Mac OS X 10.14

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
lastIndexOf	33999252.0 Ops/sec
indexOf	30188512.0 Ops/sec

Script Preparation code:

var str = "Hello world, welcome to the hello universe.";

Tests: