Basically, I understand the concepts of functional programming quite well and can also programme #purescript or #haskell relatively confidently. But when it comes to typelevel programming, I haven't quite got over this threshold yet. I would really like to understand everything better and learn more in this area, because many cool libraries are based on it.
Unfortunately, there isn't that much documentation or #purescript tutorials for dummies, i.e. for people like me. A few days ago I found a really cool introduction to the basics here. I would like to see more tutorials like this. https://blog.wuct.me/fun-with-typed-type-level-programming-in-purescript-5f8af42cfec5
I would like to see the many tutorials explain this using simple practical examples. I often find it difficult to understand the concepts in many tutorials on the subject because they are explained far too abstractly or you have to have prior knowledge, which I probably don't have after all.
@leobm The key point for me was understanding what "type A is inhabited by values x, y, z" is about.
Next, if types are some propositions in logic, then values are their proofs.
So, by writing code that compiles you're proving that some logical statement holds.
Interestingly, if you can't say something with types, no way you can write actual code that gonna work.
And of course, if a type system admits bullshit, then you can bullshit compiler with your code.
Every industrial language admits BS, but some of them make it easy to lie, cheat, AND steal (esp. with dynamic types), while the others make that painful.
A good type system can review your design before you have committed to implementing something unrealistic, being a net positive on effort spent pinning down all the important stuff.
