title: Polymorphic methods in Objective C
body: <p>In Java you can put in multiple constructors to a class that are called depending on the types and/or number of parameters that are used when an instance is constructed. 
  I assume that there is the equivalent in Objective C.</p>
  
  <p>Can I have a polymorphic method?</p>
  
  <p>I would like to build a method that acts slightly differently according to whether a string is passed or a double?</p>
  
  <p>Does that sound bonkers or is it easy?</p>