collections - Splitting out 3 or more Arrays in Scala -

Martin Oersky gives this example to divide an array into 2 collections:

   
 What's the best way to divide into 3 or more arrays:  
 Val (minors, adults, senior) = people split ?? X & lt; 18, 18 & lt; X & lt; 65, X & gt; 65 /?  
  
 
 
 It may be less beautiful to do with one-liner.    Wal (Minors, Older) = People Partition {_.age & lt; 18} Val (adult, senior) = old division {_.age