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Translate data types

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Remigiusz Suwalski 2017-01-10 10:06:27 +01:00
parent 7e3b7a5326
commit cc0bd98aee
1 changed files with 8 additions and 9 deletions
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@ -287,29 +287,28 @@ foldr (\x y -> 2*x + y) 4 [1,2,3] -- 16
(2 * 1 + (2 * 2 + (2 * 3 + 4))) (2 * 1 + (2 * 2 + (2 * 3 + 4)))
---------------------------------------------------- ----------------------------------------------------
-- 7. Data Types -- 7. Typy danych
---------------------------------------------------- ----------------------------------------------------
-- Here's how you make your own data type in Haskell -- Oto jak tworzy się nowe typy danych w Haskellu:
data Color = Red | Blue | Green data Color = Red | Blue | Green
-- Now you can use it in a function: -- Teraz można używać ich we własnych funkcjach:
say :: Color -> String say :: Color -> String
say Red = "You are Red!" say Red = "You are Red!"
say Blue = "You are Blue!" say Blue = "You are Blue!"
say Green = "You are Green!" say Green = "You are Green!"
-- Your data types can have parameters too: -- Twoje typy danych mogą posiadać nawet parametry:
data Maybe a = Nothing | Just a data Maybe a = Nothing | Just a
-- These are all of type Maybe -- Wszystkie poniższe są typu Maybe
Just "hello" -- of type `Maybe String` Just "hello" -- typu `Maybe String`
Just 1 -- of type `Maybe Int` Just 1 -- typu `Maybe Int`
Nothing -- of type `Maybe a` for any `a` Nothing -- typu `Maybe a` for any `a`
---------------------------------------------------- ----------------------------------------------------
-- 8. Haskell IO -- 8. Haskell IO