dir.entries call after dir.children returns 0
after some investigation, it turns out that one must rewind the stream before using it once more. It should be documented to avoid surprises.

• choose an already made one or write it from scratch ?

https://crystal-lang.org/api/0.35.1/Colorize.html

Getting the error when trying to run crystal run koans.cr

It seems the spec/spec_helper.cr file was deleted in this commit: 7095033

the annotation should be

@[StudentAnnotation(student_name: "myself")]

missing yaml and type_reflection

Hey, thanks for the project. It's fun, I'm a big fan of learning new languages via koans.
Quick question, is "Nil", not "nil", put intentionally here or it's a typo? It got me confused :)

https://github.com/ilmanzo/crystal-koans/blob/master/spec/booleans_spec.cr#L28

Command shards install generates error:

Resolving dependencies
Fetching https://github.com/danreeves/watch.git
Unable to satisfy the following requirements:

- `crystal (~> 0.35, >= 0.35.1)` required by `watch 1.0.1+git.commit.489bbbfaf4283f6d7a5bbf9ab34ae3c6d00713b2`
Failed to resolve dependencies, try updating incompatible shards or use --ignore-crystal-version as a workaround if no update is available.

Firstly congrats on the awesome resource, it is very pleasurable to use and understand.

Apparently in the ´generics_spec.cr´, what we have is a Stack and not a Queue.

Expecting a FIFO behaviour and getting a LIFO one can mess a bit with learners (as me) heads.

Maybe change description to use Stack instead? or change implementation to match naming?

should be json_plain and json_custom

Is there a solution for this line in nil_spec? Whenever i try the solution Nil.class.should eq Class i get the error can't use Class as generic type argument yet, use a more specific type. Did you have a different solution in mind?

Let’s improve by adding more test to parse text and files specially in regex, xml

<%%= foo %> should be <%= foo %>