title: Abusing Objective-C Shorthand Notation
body: <p>Other than giving old school Objective-C programmers heart attacks, are there any other performance implications to doing this:</p>
  
  <pre><code>NSMutableArray *derp = @[].mutableCopy
  </code></pre>
  
  <p>Versus this:</p>
  
  <pre><code>NSMutableArray *derp = [[NSMutableArray alloc] init];
  </code></pre>