Input Processing Loops in Haskell

[Simon Marlow]

> On Tue, Nov 13, 2001 at 05:02:54PM -0000, Simon Marlow wrote:
> >=20
> > You can paraphrase this in Haskell, in the IO monad, like this:
> >=20
> >    loop =3D do {
> > 	a <- get_input;
> > 	if (a =3D=3D gET_OUT) then return () else loop;
> >      }
>=20
>=20
> I follow, but I've never seen brackets used in Haskell code.  Are they
> included for clarity, or do they have syntactic value?  Is=20
> this the same
> as
>=20
>     loop =3D do=20
>            a <- get_input
>            if (a =3D=3D GET_OUT) then return () else loop
>=20
> ?

Yes, it's the same.  Some people prefer to use the explicit punctuation;
personally I use whatever looks more readable for the code I'm writing,
which in most cases means I use layout for small functions but
punctuation for large chunks of code where it's hard to see which bits
line up.

Cheers,
	Simon