Run results for: indexOf vs substr vs startsWith

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36

Browser: Chrome 73

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Script Preparation code:

var str = "abcdefghijklmnopqrstuvwxyz";

Tests: