title: why is minimum value from stringArray using colections.min() not working?
body: <p>I've been using this method to find the minimum value of doubleArray :</p>
  
  <pre><code>colections.min()
  </code></pre>
  
  <p>but when i'm using this method to string Array, it got the wrong result. Likes this :</p>
  
  <p>My stringArray value : <code>{2.3 Km, 10,0 Km, 4.0 Km, 24,7 Km}</code></p>
  
  <p>but when i call the result, its show <code>10.0 Km</code> as minimum value instead <code>2,3 Km</code>.</p>
  
  <p>Can anybody tell me what is the perfect method that i can use to get the minimum value of the srtringArray ?</p>
  
  <p>I know this is a very basic question, but i really need more explanation.
  Thank you</p>