functionalkotlin / katas

Functional Katas for all the course modules

Functional Kotlin Katas

List of katas

1 - Recursion

- Adding & Multiplying

- Reduce

- Fibonacci

2 - Functions

- Currying

- Partial Application

- CPS

3 - Functional Transforms

- Map

- Filter & Map

- FlatMap (Simple)

- FlatMap (Advanced)

- Reduce

- MapReduce

- Zip

4 - Functor

- Creating the Try Functor

5 - Monoid

- Adding Monoid to Try

6 - Monad

- Adding Monad to Try

7 - Applicative

- Adding Applicative to Try

How to test

To test the different katas you can run the unit tests provided inside the test folder.

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katas's Issues

ZipKata answer is wrong

Zip kata does not provides the right solution:
https://github.com/FunctionalKotlin/katas/tree/master/src/main/java/functional/transforms/zip

It has the MapReduce solution. The correct answer is:

fun getFirstActorMap(movies: List<Movie>, casts: List<Cast>): Map<String, String?> =
        movies.zip(casts)
                .map { (movie, cast) ->
                    movie.title to cast.people.first().name.substringBefore(" ")
                }.toMap()