Valid Palindrome II

My Solution

JavaScript

/**
 * @param {string} s
 * @return {boolean}
 */

// Checks if string passed
// is a palindrome or not
const isPalindrome = function (s) {
  return s === s.split("").reverse().join("");
};

const validPalindrome = function (s) {
  let halfLen = Math.floor(s.length / 2);
  let first, last;

  for (var i = 0; i < halfLen; i++) {
    first = i;
    last = s.length - i - 1;
    if (s[first] !== s[last]) {
      return (
        isPalindrome(s.substring(first, last)) ||
        isPalindrome(s.substring(first + 1, last + 1))
      );
    }
  }
  return isPalindrome(s);
};