Hi everyone! I'm new in FP, category theory, etc. world but a decent Kotlin developer! I want to sta...

# arrow-contributors

[Hadi Lashkari]

Hi everyone! I'm new in FP, category theory, etc. world but a decent Kotlin developer! I want to start contributing on arrow. Mostly interested on making it multiplatform. Do you mind to introduce me some simple issues that I can jump in? 😄

[Hadi Lashkari]

Nobody responded, so I start with https://github.com/arrow-kt/arrow/issues/2144

[pakoito]

I always recommend starting with some docs 😄

[pakoito]

https://github.com/arrow-kt/arrow-core/search?q=meanwhile&unscoped_q=meanwhile

[pakoito]

these typeclasses are undocumented

[pakoito]

https://github.com/arrow-kt/arrow-core/tree/master/arrow-docs/docs/arrow/typeclasses/monad

[pakoito]

see the monad docs as an example

[pakoito]

FunctorFilter is easy to understand, and you can follow up with TraverseFilter!

[pakoito]

https://github.com/arrow-kt/arrow-core/issues/11

[pakoito]

that’s also doable

[Hadi Lashkari]

good @pakoito! Thanks, I'll start from there 🙂

[pakoito]

https://github.com/arrow-kt/arrow-core/blob/master/arrow-core-data/src/main/kotlin/arrow/typeclasses/FunctorFilter.kt

[pakoito]

that’s the implementation of FunctorFilter

[pakoito]

and the test suite (laws): https://github.com/arrow-kt/arrow-core/blob/master/arrow-core-test/src/main/kotlin/arrow/core/test/laws/FunctorFilterLaws.kt

[pakoito]

it’s a functor that can filter elements 😄 You need to learn about Functor first

[pakoito]

and then kinds, from the glossary

[Hadi Lashkari]

I know about functor already 🙂

[Hadi Lashkari]

great

[pakoito]

https://arrow-kt.io/docs/0.10/patterns/glossary/