I am a newbie. Consider this code: square x = x * x add3 x y z = x + y + z leledumbo wrote:
what about (square . add3) 1 2?
It doesn't work since add3, when curried (arguments of square "blended" with add3's) with 1 argument becomes:
add3 :: Num a => a -> a -> a
which is a function that accepts 2 arguments and it's not compatible with square's a.
Thank you so much for your clarification. To understand better, I tried some definitions 1) composition = (square . add3) 5 -- illegal as you had explained 2) composition x = (square . add3) 1 2 3 -- legal, but why? what is the significance of x 3) composition x = (square . add3) x -- legal, but why? 4) composition x y = (square . add3) x y -- legal, but why? 5) composition x = (square . add3) x 3 -- legal, but why? I dont understand why the above functions are legal, and what arguments they need. Could you please give an example of how to invoke it? -- View this message in context: http://old.nabble.com/Function-composition-questions-from-a-newbie-tp2657020... Sent from the Haskell - Haskell-Cafe mailing list archive at Nabble.com.