Re: [Haskell-cafe] Re: Re-order type (flip map)

On Sun, Oct 10, 2010 at 4:47 PM, Ozgur Akgun wrote:

On 10 October 2010 22:32, Johannes Waldmann wrote:

...

Oh, and while we're at it - are there standard notations for "forward" function composition and application?

I mean instead of      h . g . f $ x I'd sometimes prefer   x ? f ? g ? h but what are the "?"

While asking you use the same symbol for function composition, and something like inverse function application. I don't think there exists an operator ?, such that h . g . f $ x is equivalent to x ? f ? g ? h.

infixl 9 ? x ? f = f x h . g . f $ x = h (g (f x)) = h (g (x ? f)) = h (x ? f ? g) = x ? f ? g ? h Luke