Re: [Haskell-beginners] Is there an idiom for this?

On 2015-11-16 12:44, Mark Carter wrote:

Suppose I want to use an argument twice, as for example in the expression: (\x -> (pred1 x) and (pred2 x))

Is there a shorter way of doing this?

I suppose you meant to write '&&' instead of 'and'? You can write it in an applicative style as (&&) <$> pred1 <*> pred2 If you like, you can shorten that a bit using 'liftA2' as liftA2 (&&) pred1 pred2 but I personally tend to like the former version better. -- Frerich Raabe - raabe@froglogic.com www.froglogic.com - Multi-Platform GUI Testing