scala function map

Here’s a cool way to use anonomous function blocks as Scala Map values.

Use case: I need a library of transformations for user input living in memory and I want to match on User Input.

case object Add
case object Subtract

val functionLibrary = Map(
  Add -> { (x: Int, y: Int) => x + y },
  Subtract -> { (x: Int, y: Int) => x - y }
)

functionLibrary(Add)(10,20)

functionLibrary(Subtract)(10,20)

I like using case objects in this way as it leverages the Scala type system. case objects also have a handy toString built in.