learnhaskell VS learn-you-a-haskell

learnhaskell

https://github.com/bitemyapp/learnhaskell/blob/master/dialog...

> a transducer is recognizing that the signature of foldl splits

> type Transducer a b = forall r. (r -> b -> r) -> (r -> a -> r)

> they compose like lenses

The author maintains an opinionated path to learning Haskell[0], albeit lacking the criticism of resources that ultimately do not make it into his final recommendation.

[0] https://github.com/bitemyapp/learnhaskell

I find the following type signature captures the essence:

type Transducer x y = forall b. (b -> y -> b) -> (b -> x -> b)

https://github.com/bitemyapp/learnhaskell/blob/master/dialog...

There's some resources here: https://github.com/bitemyapp/learnhaskell

Other than that, I'm afraid your issues are too broad to help much. If you're having trouble getting anywhere, I would recommend starting with some basic tutorial. Here are some decent ones. Haskell is not a language you can just pick up unless you have prior functional programming experience.

This is the best meta-guide I know of to learning Haskell: https://github.com/bitemyapp/learnhaskell

The LYAH is by far my favorite book for beginners, however, it lacks exercises for you to practice, but you can still move along typing and playing with the examples shown, and it’s free to read online. It’s outdated but most of the code may still be valid with little to no changes.

Learn You a Haskell For Great Good! is also a really good resource:

https://learnyouahaskell.com/

If you've never done functional, Learn You Some Erlang For Great Good was a very fun read, and I'll always love Learn You a Haskell for Great Good for showing me everything imperative languages kinda gloss over magically, as well as why I should never take a job working in Haskell!

you start that way, but don't do http://learnyouahaskell.com really?

Learn You a Haskell for Great Good!

I enjoyed http://learnyouahaskell.com/ which is available in print and digital. Fun and lighthearted while still teaching reasonable depth. YMMV.

Elm is a statically typed language inspired by Haskell. The natural step would be to use Elm on the frontend and Haskell on the backend. And that's what I tried to do. I read with some difficulty the Learn You a Haskell for Great Good! book (available for free here) and learned a lot of cool stuff. But creating a complete backend using Haskell proved to be more than I could chew. So I decided to look for alternatives...

Here y’go!