how to use reverse in string in javascript code example

Example 1: javascript reverse a string

function reverseString(s){
    return s.split("").reverse().join("");
}
reverseString("Hello");//"olleH"

Example 2: reverse a string javascript

var s = userInput[0];
var rev = [];
for(let i=0;i<s.length;i++)
{
    rev.push(s[s.length-1-i]);
}
console.log(rev.join(""));