title: Swift: Convert enum value to String?
body: <p>Given the following enum:</p>
  
  <pre><code>enum Audience {
      case Public
      case Friends
      case Private
  }
  </code></pre>
  
  <p>How do I get the string <code>"Public"</code> from the <code>audience</code> constant below?</p>
  
  <pre><code>let audience = Audience.Public
  </code></pre>