I have some team members that get weirded out when using Either, specifically around the fact that you have to wrap everything in ether Left or Right. It hit me, it's always obvious in retrospect, that it's possible to just write an implicit conversion for this and abstract it away (for better or for worse)...
1
2
3
4
5
6
7
8
9
10
implicit def aToEither[A,B](a: A): Either[A, B] = Left(a)
implicit def bToEither[A,B](b: B): Either[A, B] = Right(b)
def f(input: Either[String, Int]) = input match {
case Left(s) => println(s"Hello, $s")
case Right(i) => println(s"You are $i years old")
}
scala> f(10)
You are 10 years old