what is the x doing at the end? Why do I need to write it there?
(\x -> (>=5) x)
If I am calling the function like this: (\x -> (>=5) x) 5, what is the second x doing?
Maybe someone can explain this to me.
>Solution :
The (>= 5) is a section of an infix operator [Haskell-wiki], it is equivalent to \y -> y >= 5, it is thus a function, and we apply x to that function. This thus means that:
\x -> (>= 5) x
is thus equivalent to:
\x -> x >= 5
or simply:
(>= 5)
due to η-reduction [Haskell-wiki].