Reverse decimal digits in javascript

Question

How do I reverse the digits of a number using bitwise?

input:

x = 123; 

output:

x = 321; 

Answer 1

//reverse integer
const revInt = (num)=>{
  //turn into string
  if(Math.sign(num)===1)
    return parseInt(num.toString().split('').reverse().join(''));
  else return -1*parseInt(num.toString().split('').reverse().join(''));
}

console.log(revInt(-501));