Question

I want to create a simple Map from math operators to the relevant functions:

var ops = Map("+" -> +, "-" -> -)

How would I do this in Scala?

Answer 1

val ops = Map("+" -> ((_: Int) + (_: Int)), "-" -> ((_: Int) - (_:Int)))

or

val ops = Map[String, (Int, Int) => Int]("+" -> (_+_), "-" -> (_-_))

or even, for actual currying,

val ops = Map("+" -> ((_: Int) + (_: Int)).curried, "-" -> ((_: Int) - (_:Int)).curried)

These functions are all bind to Int. Well, Scala is not a point-free programming language, it’s an object oriented one, and one in which there’s no superclass common to all numeric types. Anyway, if you object to that, then you have an entirely different problem, which was asked and answered many times here on Stack Overflow (in fact, it was my first Scala question, iirc).