September 2017
Beginner to intermediate
396 pages
9h 46m
English
Content preview from Haskell Cookbook
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How to do it...
- Open src/Main.hs for editing.
- Add the following data type for representing the days in a week:
data Days = Sunday | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday deriving Show
- Now, add the Variant type that takes five type arguments:
data Variant a b c d e = Variant0 | Variant1 a | Variant2 b | Variant3 c | Variant4 d | Variant5 e deriving Show
- Now, use the preceding types in our main function:
main :: IO () main = do putStrLn $ "Sum Type 1 : Showing days of the week" putStrLn $ show [Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday] putStrLn $ "Days type can have only 7 values" putStrLn "" putStrLn "Sum Type 2 : Variant with 5 possible data constructors" putStrLn "Each constructor contribues ...
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