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egonSchiele/Mario.hs

Created July 15, 2013 01:41
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Lens example using Mario
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Mario.hs
{-# LANGUAGE TemplateHaskell #-}
import Control.Lens
data Point = Point {
_x :: Double,
_y :: Double
} deriving (Show)
data Mario = Mario { _location :: Point } deriving (Show)
makeLenses ''Point
makeLenses ''Mario
player1 = Mario (Point 0 0)
main = print (location.x +~ 10 $ player1)
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