title: Mutable to immutable object
body: <p>Is there a way to convert mutable object converted to immutable one in cocoa?
  I have used NSMutableDictionary *mut=[[NSMutableDictionary alloc] initWithDictionary: copyItems:];
  But this dictionary is used in many other places without the mutable thing. </p>
  
  <p>Best Regards,
  Subrat</p>