Benchmark: String slice vs. array slicee

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")

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Related benchmarks:

String slice vs. array slicee (version: 0)