title: How do I convert an Array[String] to a Set[String]?
body: <p>I have an array of strings. What's the best way to turn it into an immutable set of strings?</p>
  
  <p>I presume this is a single method call, but I can't find it in the scala docs.</p>
  
  <p>I'm using scala 2.8.1.</p>