[Haskell-cafe] Fixity of >>>
ross at soi.city.ac.uk
Thu Jul 26 10:46:40 EDT 2007
On Fri, Jul 27, 2007 at 12:08:30AM +1000, Donald Bruce Stewart wrote:
> There's a theory this should work:
> getContents >>= lines >>> map read >>> sum >>> print
> But unfortunately we have:
> `(>>=)' [infixl 1]
> `(>>>)' [infixr 1]
> Meaning we must write:
> getContents >>= (lines >>> map read >>> sum >>> print)
> Indeed, all Arrow ops are infixr.
> Are there any technical/compelling reasons for this?
Not that I can recall. But it's the precedence rather than the
associativity that's bothering you here.
More information about the Haskell-Cafe