Benchmark: String slice vs. array sliceee

Tests:

String concat
var arr = new Map() let prev="" for (let i = 0;i<1000;++i){ prev+="ABC:"; arr.set(+i,prev); } function process(s){ return s.slice(0,s.lastIndexOf(':')) } for (const [key,value] of arr){ let s = process(arr.get(key)) while(s.length){ s = process(s) } arr.delete(key) }
Array spread
var arr = new Map() let prev=[] for (let i = 0;i<1000;++i){ prev =[...prev, 'ABC'] arr.set(+i,prev); } function process(s){ return s.slice(0,s.length-1) } for (const [key,value] of arr){ let s = process(arr.get(key)) while(s.length){ s = process(s) } arr.delete(key) }
Array with concat
var arr = new Map() let prev=[] for (let i = 0;i<1000;++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){ let s = process(arr.get(key)) while(s.length){ s = process(s) } arr.delete(key) }

Rendered benchmark preparation results:

Previous results

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Latest run results:

Run details: (Test run date: 11 months ago)

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/OS: Chrome 109 on Windows

String slice vs. array sliceee (version: 0)