Small and good scala projects to learn scala -- especially functional programming and type system [closed]

Question

I've studied scala for several months, but still at the beginner level. Now I found I have huge trouble with functional programming and scala's type system.

I tried finding some documents and blogs, but I can't understand most of them(especially type-system ones). So I'm looking for some small and good scala projects that I can read the sources to learn.

Could you please recommend me some?

Answer 1

There's a popular set of "Scala Problems" out there, called the 99 Scala Problems

Problems come in all difficulties, and many flavors, basic functional programming included.