JSFiddle - React, Tailwind, and code Playground

by KIRAN VARTHI

HTML

<button>click</button>

JavaScript

$("button").click(function(){
    var str = 'Hello World';
    str = setCharAt(str,4,'a');
    alert(str);
});

function setCharAt(str,index,chr) {
    if(index > str.length-1) return str;
    return str.substr(0,index) + chr + str.substr(index+1);
}