Counting steps to make number palindrome in JavaScript

Problem

We are required to write a JavaScript function that takes in a number, num, as the first and the only argument.

Our function should return 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.

For example, if the input to the function is −

Input

const num = 87;

Output

const output = 4;

Output Explanation

Because the steps involved are −

87 + 78 = 165; 165 + 561 = 726; 726 + 627 = 1353; 1353 + 3531 = 4884

Example

Following is the code −

 Live Demo

const num = 87; const countSteps = (num) => {    let res = 0;    while (!isPalindrome(num)) {    res++    num += +('' + num).split``.reverse().join`` };    return res; } const isPalindrome = num => {    let i = 0    let str = '' + num    while (i++ <= str.length / 2) {       if (str[i] !== str[str.length - 1 - i]) return false    };    return true } console.log(countSteps(num));

Output

4