title: Difference between "nil" ,"empty" and "few space bar typed" in Swift
body: <p>I have a text box, what values will it contain if:</p>
  
  <ol>
  <li>I type nothing.</li>
  <li>I type few space bars.</li>
  </ol>
  
  <p>Are these 2 different things? Is <code>nil</code> different from both of them?</p>