Run results for: String slice vs. array slice

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 16_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/113.0.5672.121 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 113

Operating system: iOS 16.4

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
String slice	25992040.0 Ops/sec
Array slice	24809840.0 Ops/sec
Array with creation	1592.1 Ops/sec
String with creation	229.2 Ops/sec

Script Preparation code:

var str = ""
var arr = []
for (let i = 0; i < 100000; ++i) {
    str += 'ABC::';
    arr.push('ABC');
}

Tests:

String slice
function process(s){ return s.slice(0,s.lastIndexOf(':')) } while (str.length) { str = process(str); }
Array slice
function process(a){ return a.slice(0,a.length-2) } while (arr.length) { arr = process(arr); }
Array with creation
let str = "" for (let i = 0; i < 100000; ++i) { str += 'ABC:'; } function process(a){ return a.slice(0,a.length-2) } while (arr.length) { arr = process(arr); }
String with creation
let str = "" for (let i = 0; i < 100000; ++i) { str += 'ABC:'; } function process(s){ return s.slice(0,s.lastIndexOf(':')) } while (str.length) { str = process(str); }

Run results for: String slice vs. array slice

String slice

Array slice

Array with creation

String with creation