title: is there a method to get the Max and Min of an NSMutableArray
body: <p>Is there a way in iOS for me to get the Max and Min values of an NSMutableArray of double numbers. I'm looking for an already existing method, not for me to sort the array my self. If there is a method for me build into the API for me to sort the array that would interest me too.</p>
  
  <p>Thank you</p>