haskell

-- comment

: prepend to a list (also known as cons) 'a':[] --> ['a'] 'a':[] --> ['a']

++ concatinate lists "hello" ++ "World --> "Hello World" [1,2,3] ++ [4] --> [1,2,3,4]

. compose two functions f(g(x)) == (f . g)(x) let third = (head . tail . tail) third [1,2,3] --> 3

>> reverse compose two functions (more readable) let (>>) f g x = g (f x) let third = tail >> tail >> head third [1,2,3] --> 3

$ add

let (|>) x f = f x

!! means access element in list (['a','b'] !! 0) == 'a'