Haskell

Declare functions with type in ghci

To declare a function inside GHCi one should use a let word for function name.

To declare the type explicitly it should be specified after declaring a function name, and the function body should go next after a semicolon:

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let myFunc :: Int -> Int -> Int; myFunc x y = x + y

or on the next line but with identation:

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let myFunc :: Int -> Int -> Int
    myFunc = (+)