Why do case class companion objects extend FunctionN?

Question

When you create a case class, the compiler creates a corresponding companion object with a few of the case class goodies: an apply factory method matching the p

Answer 1

Aside from oxbow_lakes's reply about the naturalness of it, it can often be useful to have constructors available as first-class functions, particularly in conjunction with Scala collections higher-order functions. For (a trivial) example,

scala> case class Foo(i : Int)
defined class Foo

scala> List(1, 2, 3) map Foo   
res0: List[Foo] = List(Foo(1), Foo(2), Foo(3))