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

Since you used a case class you could extend with Ordered like such:

case class A(tag:String, load:Int) extends Ordered[A] { 
  def compare( a:A ) = tag.compareTo(a.tag) 
}

val ls = List( A("words",50), A("article",2), A("lines",7) )

ls.sorted