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function palindrome(str) {
  
  
  // convert string to lowercase and replace characters with ""
  // split into array then reverse and join back up
  // finally compare ArrayStrRev to strLowered
  
   strLowered = str.toLowerCase().replace(/[_:(-/,.\s]+/g, "");
    strRev =  strLowered.split("");
     var ArrayStrRev = strRev.reverse().join("");
  if (strLowered === ArrayStrRev) {
   
  return true; 
   }else{
  return false;
 }

}

palindrome("race car");