title: How to find the max value in a Swift object array?
body: <p>Let say I got an array with <code>Usr</code> objects. And the <code>Usr</code> object have the attribute <code>age</code>. Except from reading the <code>Usr</code>object one by one, and compare the <code>age</code> value one by one, is there any shortcuts to do so? Thx.</p>