check4palindromes.js

//Requirements: lowercase, non-alphanumeric chars + no underscores

function palindrome(str) {
  
  str = str.toLowerCase();
  
  str = str.replace(/\W/g, ""); //Remove all non-alphanumeric chars
  
  str = str.replace(/_/g, ""); //Remove all underscore chars
  
  //  All at once ->  str = str.toLowerCase().replace(/\W|_/g, ""); 
 
  if (str == str.split("").reverse().join('')){ // Check 
    return true; // If it's a palindrome
  }
  return false; // If it's not
  
}