title: how to use string.join to join value from an object array?
body: <p>I have an array of object e.g:</p>
  
  <pre><code>MyObject[] objs;
  </code></pre>
  
  <p>and within MyObject it contains a  string property,</p>
  
  <pre><code>object[0].stringValue
  </code></pre>
  
  <p>If I want to join the whole array of objects by their <code>stringValue</code>, how can I do it?</p>