[Haskell-cafe] defining mapPairs function

[Alexteslin]

Hello,

I just came across with this question on the exam and can not think of
implementing it.

mapPair :: (a -> a -> a) -> [a] -> [a]

such that mapPairs f [x1, x2, x3, x4...] = [f x1 x2, f x3 x4,...]

and if the list contains an odd number of elements, the last one is kept
unchanged, for example

mapPairs f [x1, x2, x3] = [f x1 x2, x3]


Any ideas will be appreciated, thanks
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