Run results for: indexOf vs substr vs startsWith

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:65.0) Gecko/20100101 Firefox/65.0

Browser: Firefox 65

Operating system: Mac OS X 10.11

Device Platform: Desktop

Date tested: 5 years ago

Script Preparation code:

var str = "abcdefghijklmnopqrstuvwxyz";

Tests: