Defining a Map from String to Function in Scala

Question

I am trying to define a Map literal with key: String, value: (Any)=>String. I tried the following, but get a syntax error:

def foo(x         


        

Answer 1

Trait Function1 is contravariant for parameter, so def foo(x: Int): String is not a (Any) => String. So the following would work:

scala> def baz(x: Any): String = "baz"                         
baz: (x: Any)String

scala> val m2 = Map[String, (String) => String]("hello" -> baz)
m2: scala.collection.immutable.Map[String,(String) => String] = Map((hello,))