Run results for: Performance Test: substring vs substr vs slice vs split

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) QwantMobile/6.7.6 Mobile/15E148 Safari/605.1.15

Browser: Mobile Safari 18

Operating system: iOS 18.5

Device Platform: Mobile

Date tested: one year ago

slice

235.1M/s

substring

228.6M/s

substr

31.2M/s

split

9.5M/s

View exact numbers

Test name	Executions per second
✓ slice	235,120,816 Ops/sec
substring	228,595,856 Ops/sec
substr	31,237,382 Ops/sec
split	9,488,849 Ops/sec

Script Preparation code:

var string = "I am the god of hellfire, and I bring you..."

Tests:

slice
var substring = string.slice(17, 25);
substring
var substring = string.substring(17, 25);
substr
var substring = string.substr(17, 25);
split
var substring = string.split(',')[1];