title: NSUserDefaults removeObjectForKey vs. setObject:nil
body: <p>Are the following two lines equivalent?</p>
  
  <p>1.
      <code>[[NSUserDefaults standardUserDefaults] removeObjectForKey:@"example key"]</code></p>
  
  <p>2.
      <code>[[NSUserDefaults standardUserDefaults] setObject:nil forKey:@"example key"]</code></p>