Run results for: template + subtrings vs Regex

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36

Browser: Chrome 79

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Template + subtring	2730514.0 Ops/sec
Regex	999641.4 Ops/sec

Script Preparation code:

var nowTime = '120102'

Tests:

Template + subtring
`${nowTime.substring(0,2)}:${nowTime.substring(2,4)}:${nowTime.substring(4,6)}`
Regex
nowTime.replace(/(\d{2,2})(\d{2,2})(\d{2,2})/, '$1:$2:$3')