Cat xor example 1

cats_xor_example1.scala

import cats.data.Xor

class Boom(msg:String) extends Error(msg)

def boomXorUnit(blowUp: Boolean): Boom Xor Unit =
  if(blowUp) Xor.Left(new Boom("kaboom"))
  else new Xor.Right(())

val left = boomXorUnit(true)
val right = boomXorUnit(false)

left.fold(e => s"I am a left: ${e.getMessage} ", s => s"I am a right: $s") //  res0: String = I am a left: kaboom
right.fold(e => s"I am a left: ${e.getMessage} ", s => s"I am a right: $s") // res1: String = I am a right: ()

//Right biased so don't have / need right map
left.leftMap(e => s"I am a left: ${e.getMessage}") // res2: cats.data.Xor[String,Unit] = Left(I am a left: kaboom)
right.leftMap(e => s"I am a left: ${e.getMessage}") // res3: cats.data.Xor[String,Unit] = Right(())