title: run another function after preceding function has completed?
body: <p>if i fire up 2 functions like this:</p>
  
  <pre><code>prepare_data();
  read_data();
  </code></pre>
  
  <p>then i guess they are running at the same time. but as you can see function two is depending on the first one, so how can i make the latter one run after the first one is completed?</p>