Palindrome chain length

Palindrome chain lengthCodewars

Approach

1. convert input number to string

2. slice process-1 string half, and check it's a palindrome if palindrome return step

3. if it's not palindrome call process-1 with increase value (input + reversed input) and step + 1

Solution

JavaScript

const palindromeChainLength = (n, step = 0) => {
  const str = String(n);
  
  if (str.substr(0, Math.ceil(str.length / 2)) ===
    [...str.substr(Math.floor(str.length / 2))].reverse().join('')) {
    return step;
  }
  
  return palindromeChainLength(n + Number(str.split('').reverse().join('')), step + 1);
};