Easy idiomatic way to define Ordering for a simple case class

Question

I have a list of simple scala case class instances and I want to print them in predictable, lexicographical order using list.sorted, but receive \"No implicit O

Answer 1

The sortBy method would be one typical way of doing this, eg (sort on tag field):

scala> l.sortBy(_.tag)foreach(println)
A(article,2)
A(lines,7)
A(words,50)