title: remove object from NSMutableArray by key
body: <pre><code>NSMutableArray *array = [NSMutableArray arrayWithObjects:@{@"name":@"Jenny",@"age":@23},@{@"name":@"Daisy",@"age":@27},nil];
  </code></pre>
  
  <p>Is it possible to remove object by key in the array's dictionary object?</p>
  
  <p>For example. remove object by age = 27</p>