title: How to watch a NSMutableArray's count change using LLDB
body: <p>To watch a array I do like this:</p>
  
  <pre><code>NSMutableArray *myArray = [@[] mutableCopy];
  // set a lldb watchpoint here: (lldb) w s v myArray
  </code></pre>
  
  <p>However this kind of watchpoint ONLY WORKS when the memory address change eg:</p>
  
  <pre><code>myArray = [NSMutableArray array];
  </code></pre>
  
  <p>What I want to watch is myArray's content change eg:</p>
  
  <pre><code>[myArray addObject: @1] //I want get notify when this thing happen
  </code></pre>
  
  <p>Is anybody face the same problem, How do you achieve this kind of thing.</p>