How do you write the function 'pairs' in Haskell?

Question

The pairs function needs to do something like this:

pairs [1, 2, 3, 4] -> [(1, 2), (2, 3), (3, 4)]

Answer 1

You could go as far as

import Control.Applicative (<*>)
pairs = zip <*> tail

but

pairs xs = zip xs (tail xs)

is probably clearer.