title: Combining Arrays in Scala
body: <p>If I have <code>DerivedType1:BaseType</code> and <code>DerivedType2:BaseType</code> and <code>Array[DerivedType1]</code> and <code>Array[DerivedType2]</code>, what's the most succinct way of combining them into <code>Array[BaseType]</code>?</p>