Run results for: wuirefs81326wysdhsseyt

Run details:

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: Chrome 81

Operating system: Windows 7

Device Platform: Desktop

Date tested: 4 years ago

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

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')