haskell - creating a function that takes a list of Ints and returns the list with any odd numbers squared -

i want write function similar filter using odd function takes list , returns list odd numbers squared.

ex

gchi> sqrodd [1,2,3,4,5] [1,2,9,4,25] 

what have , believe close is

sqrodd :: (a->bool) -> [a] -> [a] sqrodd odd []     = [] sqrodd odd (x:xs) = if odd x                     (x*x) :sqrodd odd xs                     else x : sqrodd odd xs 

but errors function definition saying "couldn't match expected type a -> bool actual type [a]"

as wrote yourself, want function takes list argument , returns list, instead of having type signature

    sqrodd :: (a->bool) -> [a] -> [a] 

you should make function type signature looks this

    sqrodd :: [a] -> [a] 

which have written on beginning. because of compiler expects, first argument of function function of (a -> bool). should remove odd arguments list , change type signature shown above. cause function use odd prelude instead of expecting filter function argument.

another way of doing it, renaming function as, example sqrfiltered , can define sqrodd partially applied sqrfiltered

    sqrodd = sqrfiltered odd 

not tested, should right.