function palindrome(str) {

  // Strip non-alphanumeric and convert to lowercase
  var string = str.replace(/[^0-9a-z]/gi, '').toLowerCase().split("");

  // Iterate over half the number of chars in the string
  for(var i= 0; i < (string.length)/2; i++){

    // Check i'th character from beginning and i'th character from end, accounting for 0.
    if(string[i] !== string[string.length-i-1]){
      return false; // False if any characters don't match
    }
  }
  return true; // True if palindrome
}