Run results for: indexOf vs substr vs startsWith

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0

Browser: Firefox 64

Operating system: Windows 7

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var str = "abcdefghijklmnopqrstuvwxyz";

Tests: