Reverse Integer in javascript leetcode problem

let value=121;

const reverse= function(value) {

    //convert the value into string and then split then reverse then join the string 

  

    let revVal=value.toString().split("").reverse().join("");

   

   //convert the string into number using parseInt

    revVal=parseInt(revVal)

   //use math.abs function for taking absolute value then multiply with sign of original value 

    revVal=Math.abs(revVal)*Math.sign(value)

    if (revVal>= 2**31|| revVal < 2**31*(-1)) {

        return 0;

    }

    else{

        return revVal

    }

};

reverse(value);