title: Differences between [NSArray arrayWithArray:] and [NSArray copy]
body: <p>lately I work much with arrays and I'm wonder.. what's diffrences between those two lines.</p>
  
  <pre><code>NSArray *array = [NSArray arrayWithArray:someArray];
  </code></pre>
  
  <p>and</p>
  
  <pre><code>NSArray *array = [someArray copy];
  </code></pre>
  
  <p>Which of it is faster? What in case we have <code>NSMutableArray</code> and <code>mutableCopy</code>? </p>