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Call an object method: Difference between revisions
→{{header|Haskell}}: added solution
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L := [cp1]
end</lang>
=={{header|Haskell}}==
Haskell doesn't have objects in OOP sence (i.e. first-class sitizens
appearing in runtime with incapsulated state and ability to send messages (methods) to other objects).
Haskell has first-class immutable records with fields of any type, representing abstraction and incapsulation (due to purity).
Polymorphism is implemented via type-classes, which are similar to OOP interfaces.
Dummy example:
<lang haskell>data Obj = Obj { field :: Int, method :: Int -> Int }
-- smart constructor
mkAdder :: Int -> Obj
mkAdder x = Obj x (+x)
-- adding method from a type class
instanse Show Obj where
show o = "Obj " ++ show (field o) </lang>
<pre>*Main> let o1 = Obj 1 (*5)
*Main> field o1
1
*Main> method o1 6
30
*Main> show o1
Obj 1
*Main> let o2 = mkAdder 5
*Main> field o2
5
*Main> method o2 6
11
*Main> show o2
Obj 5</pre>
=={{header|J}}==
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