title: Changing the value of a NSIndexPath object
body: <p>If I have an index path with value : { 0, 0}.  What is the proper way to change it to { 0, 1} ?  I know if it were an ordinary c array it would just be :</p>
  
  <pre><code>unsigned i_array[] = { 0, 0};
  i_array[1] = 1;
  </code></pre>
  
  <p>But from NSIndexPath's documentation, the closest I can get is with :</p>
  
  <pre><code>– indexPathByRemovingLastIndex
  – indexPathByAddingIndex:
  </code></pre>
  
  <p>It seems a bit cumbersome.  Is there a way that I can just overwrite the last member of the index array ? </p>