On 9/28/06, Brian Hulley
On Thursday, September 28, 2006 1:33 AM, Greg Fitzgerald wrote:
Since there's talk of removal of the composition operator in Haskell-prime, how about this:
Instead of: foo = f . g
you write: foo = .g.f
A leading dot would mean, "apply all unnamed parameters to the function on the right". A trailing dot would mean, "apply the result of the left to the function on the right".
Hi -
I think the H' proposal http://hackage.haskell.org/trac/haskell-prime/wiki/CompositionAsDot is an extremely bad idea. I really don't see why people have so many problems with the idea of just placing spaces before and after the dot when used as an operator,
If C had something like that, we would use it as yet more reasons to make fun of it for. Spaces around operators shouldn't be significant. It's just extremly messy and ugly IMO.
and in any case it's hard to think of a more important operator in a functional language than composition and a more fitting symbol for it than the simple dot.
Well I would think that '=' is more important, for example. Or how about ->? There are many operators that absolutely essential for the langauge. Composition is, after all, merely a library function. The dot is a nice low-noise operator that could be put to good use as selectors of records and modules (being simliar to other languages in that regard is not a goal in itself, but certainly doesn't hurt). Reserved symbols should get to "choose first" IMO, and then the rest can be used for library functions. How aboug using <> for compositon? It almost looks like a ring. -- Sebastian Sylvan +46(0)736-818655 UIN: 44640862