Run results for: String slice vs. array slicee

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser: Chrome 109

Operating system: Windows

Device Platform: Desktop

Date tested: 11 months ago

Tests:

String concat
var arr = new Map() let prev="" for (let i = 0;i<10000;++i){ prev+="ABC:"; arr.set(+i,prev); } function process(s){ return s.slice(0,s.lastIndexOf(':')) } for (const [key,value] of arr){ arr.delete(key) }
Array spread
var arr = new Map() let prev=[] for (let i = 0;i<10000;++i){ prev =[...prev, 'ABC'] arr.set(+i,prev); } function process(s){ return s.slice(0,s.length-1) } for (const [key,value] of arr){ arr.delete(key) }
Array with concat
var arr = new Map() let prev=[] for (let i = 0;i<10000;++i){ prev = prev.concat('ABC') arr.set(+i,prev); } function process(s){ return s.slice(0,s.length-1) } for (const [key,value] of arr){ arr.delete(key) } console.log("hello")