category theory in scala code example

Example: Category Theory laws in scala

scala> :pastesealed trait Breakfast {}case object Eggs extends Breakfast {}case object Oatmeal extends Breakfast {}case object Toast extends Breakfast {}case object Coffee extends Breakfast {}val favoriteBreakfast: Person => Breakfast = {  case John => Eggs  case Mary => Coffee  case Sam  => Coffee}// Exiting paste mode, now interpreting.favoriteBreakfast: Person => Breakfast = <function1>