check-for-palindromes.js

/* 
* Return true if the given string is a palindrome. Otherwise, return false.
* A palindrome is a word or sentence that's spelled the same way both forward and backward, ignoring punctuation, case, and spacing.
* Note: You'll need to remove all non-alphanumeric characters (punctuation, spaces and symbols) and turn everything lower case in order to check for palindromes.
* We'll pass strings with varying formats, such as "racecar", "RaceCar", and "race CAR" among others.
* We'll also pass strings with special symbols, such as "2A3*3a2", "2A3  3a2", and "2_A3*3#A2".
* * * https://www.freecodecamp.org/challenges/check-for-palindromes
*/

function palindrome(str) {  
  var alphanumeric = str.replace(/[\W_]/g, '').toLowerCase();  
  var reverse = alphanumeric.split('').reverse().join('');  
  if (alphanumeric == reverse) {    
      return true;  
  } else {
      return false;  
   }
}

palindrome("not a palindrome");