title: Replace last comma in string with an "and". (Objective-C)
body: <p>I'm looking for a good way in Objective-C to replace the last comma in a string with the word "and". Any suggestions?</p>
  
  <p>"Red, Green, Blue, Yellow"</p>
  
  <p>becomes</p>
  
  <p>"Red, Green, Blue and Yellow"</p>