Benchmark: wuirefs81326wysdhsseyt

Tests:

array
String.prototype.replaceAt=function(index, char) { var a = this.split(""); a[index] = char; return a.join(""); }; 'abcde'.replaceAt(2,'a')
mine
const emptyArray = (index, item) => { var temp = new Array(index); temp[index] = item; return temp; }; String.prototype.replaceAt = function(index, char) { return Object.assign([...this], emptyArray(index, char)).join(``); }; 'abcde'.replaceAt(2,'a')

Rendered benchmark preparation results:

Previous results

Test case name	Result
array
mine

ⓘ Get performance results from real users on your website with Request Metrics.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36

Browser/OS: Chrome 81 on Windows 7

Test name	Executions per second
array	673131.3 Ops/sec
mine	201251.2 Ops/sec

wuirefs81326wysdhsseyt (version: 0)