Haskell Programming Tutorial-10: Simple Input and Output (English Version)

[damilareoyebanji]

Great work @superlinux, I am really enjoying the tutorials. Please is there any video on understanding the Type Check of Haskell . I mean how to read functions and getting the principle / general Type . For example the Principle Type of \f -> f True is (Bool -> a ) -> a, I got that from using :t but I don't understand how it been derived or how it works.