JSFiddle - React, Tailwind, and code Playground

by Daedalus

JavaScript

function ReplaceAt(input, search, replace, start) {
		return input.slice(0, start)
    	+ input.slice(start).replace(search, replace)
      + input.slice(input.slice(0).length);
	}
  
alert(ReplaceAt("my first my test", "my", "uuu", 9));