title: How to add an object to the end of an NSMutableArray
body: <p>I have the following code</p>
  
  <pre><code>NSMutableArray *plistArray = [[NSMutableArray alloc] initWithContentsOfFile:filepath];
  [plistArray insertObject:title atIndex:2];
  </code></pre>
  
  <p>but would like to rather add the object to the end of the array.</p>
  
  <p>How can this be done, and do I need to set the last value to nil, at the moment I dont and it works fine. </p>
  
  <p>Regards</p>