Palindrome chain length

7 kyu
Palindrome chain length

Number is a palindrome if it is equal to the number with digits in reversed order. For example, 5, 44, 171, 4884 are palindromes, and 43, 194, 4773 are not.

Write a function which takes a positive integer and returns the number of special steps needed to obtain a palindrome. The special step is: "reverse the digits, and add to the original number". If the resulting number is not a palindrome, repeat the procedure with the sum until the resulting number is a palindrome.

If the input number is already a palindrome, the number of steps is 0.

All inputs are guaranteed to have a final palindrome which does not overflow MAX_SAFE_INTEGER.

Example
For example, start with 87:

  87 +   78 =  165     - step 1, not a palindrome
 165 +  561 =  726     - step 2, not a palindrome
 726 +  627 = 1353     - step 3, not a palindrome
1353 + 3531 = 4884     - step 4, palindrome!


const palindromeChainLength = function(n) {
  const reversed = parseInt((""+n).split('').reverse().join(''))
  if(n != reversed){
    return 1 + palindromeChainLength (n + reversed)
  }
  return 0;
};


console.log(palindromeChainLength(87), 4);
console.log(palindromeChainLength(89), 24);
console.log(palindromeChainLength(10), 1);