[Haskell-beginners] question about list processing

[Dennis Raddle]

On Thu, Nov 12, 2015 at 6:32 AM, David McBride <toad3k at gmail.com> wrote:

> There was some real controversy over this change.  People were strongly
> opposed to the change for exactly the reason you gave (among others), that
> it is hard for beginners.  However, there was enough momentum that it went
> through, and now things like fmap and length work on a wide variety of data
> types.  You can google ftp haskell controversy for more info.
>
>



Thanks, David. As far as instances of Functor, Applicative, and Monad, so
far I've mostly used lists and Maybe. I've never taken specific advantage
of Traversable.

Could you suggest a new type for me to explore? I mean something that could
have instances in any of the above classes, one or all.

I only use Haskell for an occasional hobby project so despite having
started five years ago, I consider myself a beginner. My project involves
playing music by transforming a musical score into MIDI commands and
sending them to a software synthesizer. As far as library types, I mostly
use Map, lists, and Maybe. These are all I have needed to look for patterns
in lists or Maps of notes. But I'm sure I'm missing out on something.

D
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