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  1. or download this
    type Name = String

...

-- then:
lowerName "KELAN" -- evaluates to "kelan"
  2. or download this
    data Piece = Pawn | Rook | Knight | Bishop | Queen | King

...
-- then:
promotesTo Pawn -- evaluates to [Rook, Knight, Bishop, Queen]
promotesTo $ head $ promotesTo Pawn -- evaluates to []
  3. or download this
    data Rectangle
    = UnitSquare
...

v3 :: Rectangle
v3 = Rect 5 9