revStr.js

// Description:

// A phrase is a palindrome if, after converting all uppercase letters into lowercase letters and removing all non-alphanumeric characters, it reads the same forward and backward. Alphanumeric characters include letters and numbers.
// Given a string s, return true if it is a palindrome, or false otherwise.

// Example 1:
// Input: s = "A man, a plan, a canal: Panama"
// Output: true
// Explanation: "amanaplanacanalpanama" is a palindrome.

// Example 2:
// Input: s = "race a car"
// Output: false
// Explanation: "raceacar" is not a palindrome.

// Example 3:
// Input: s = " "
// Output: true
// Explanation: s is an empty string "" after removing non-alphanumeric characters.
// Since an empty string reads the same forward and backward, it is a palindrome.

// my solution
var isPalindrome = function (s) {
  const str = s.toLowerCase().replace(/[^a-z0-9]/g, "");
  const reverseStr = str.split("").reverse().join("");
  return str === reverseStr;
};