title: Idiomatic method to convert Array into ListBuffer
body: <p>I'm looking for a cleaner solution than this:</p>
  
  <pre><code>import scala.collection.mutable.ListBuffer
  
  val y = Array(1,2,3,4)
  val z = new ListBuffer[Int]()
  y.foreach(elem =&gt; z += elem)
  </code></pre>