title: How to get the largest and smallest elements in a 2 dimensional array in dart?
body: <p>I have a 2 dimensional array:</p>
  <pre><code>List&lt;List&lt;double&gt;&gt; intArr = [[467.0, 445.5], [480.0, 448.5],
                               [502.5, 450.5], [542.5, 449.5],
                               [575.0, 444.0], [610.5, 442.5],
                               [650.5, 447.5], [670.5, 451.5],
                               [700.5, 456.0], [723.5, 456.0],
                               [729.5, 456.0], [730.0, 456.0],
                               [730.0, 456.5]]
  </code></pre>
  <p>I want to get the biggest and smallest elements in this array. How do I do it?</p>