title: Why should I not be using [NSDictionary objectForKey:]?
body: <p>I recently started using Faux Pas (<a href="http://fauxpasapp.com/" rel="nofollow">http://fauxpasapp.com/</a>), and for my project I get the following warning a number of times:</p>
  
  <p><strong>Old, verbose Objective-C syntax</strong></p>
  
  <pre><code>-[NSDictionary objectForKey:] is called. Consider using an Objective-C subscript expression instead.
  </code></pre>
  
  <p>I'm unsure what the subscript expression is, and I'm not having much luck finding anything on it.  I was curious if anyone here could help.</p>
  
  <p>Thanks!</p>