Palindrome Number

palindrome_number.js

// Example #1
/**
 * @param {number} x
 * @return {boolean}
 */
var isPalindrome = function(x) {
  if (x < 0) return false

  let rev = 0
  for(let i = x; i >= 1; i = Math.floor(i/10)) rev = rev*10 + i%10
  return rev === x
    
};

// Example #2
/**
 * @param {number} x
 * @return {boolean}
 */
var isPalindrome = function(x) {
    if(x<0) return false;
    return reverse(x)===x;
};

function reverse(num){
    let out = 0, rem = 0;
    while(num){
        rem = num%10;
        out = out*10 + rem;
        num = Math.floor(num/10);
    }
    return out;
}

// Example #3 - String 🙅‍♀️
/**
 * @param {number} x
 * @return {boolean}
 */
var isPalindrome = function(x) {
    if (x < 0) return false;
	
    // reverse the string representation of x
    const reverse = `${x}`.split('').reverse().join('');
    // compare the value regardless of types
    return x == reverse;
};