And then you look at all the other languages which don't wrap the list/vector/array/collection with an optional type. So why should haskell? "null" in another languages it not the same as "Maybe" in haskell !!

If the input array is empty or null, return an empty array:

C#/Java: new int[] {} / new int[0];
C++: std::vector<int>();
JavaScript/CoffeeScript/TypeScript/PHP/Haskell: [];
Rust: Vec::<i32>::new();

that's why i'm reporting an issue

In haskell it's an anti-pattern to represent False by the string "False". Maybe String is the right return type here.

My point is if a kata builds upon (the knowledge gained of) another kata, that the latter one should be offered first by codewars. Or get some notification about it.

Question: “A farm contains chickens and cows. There are x legs and y heads. How many chickens and cows are there?”
Line of tescase: animals 72 200 shouldBe Just (44,28)
Line of code: animals --Code

you have to fill in: animals y x =
for it to make sense

"there are x legs and y heads" --> x first then y
"animals 72 200" --> y first then x

Lame kata after already solving https://www.codewars.com/kata/beginner-lost-without-a-map

Too similar to https://www.codewars.com/kata/hex-to-decimal

Pretty lame kata after already having solved https://www.codewars.com/kata/is-the-string-uppercase this one should be removed or the order in which kata's are offered should be adjusted.

too similar to https://www.codewars.com/kata/calculate-average

too similar to https://www.codewars.com/kata/get-the-mean-of-an-array

Haskell, this kata is broken

/tmp/haskell117113-5-krdjxg.m7t3i35wmi/Banjo.hs:1:53:
Not in scope: main' Perhaps you meant min' (imported from Prelude)

Haskell: This kata is lame after already completed https://www.codewars.com/kata/square-every-digit https://www.codewars.com/kata/noobcode-01-supersize-me-dot-dot-dot-or-rather-this-integer https://www.codewars.com/kata/alan-partridge-ii-apple-turnover https://www.codewars.com/kata/parse-float

Haskell:
/tmp/haskell117113-5-144mrrq.db2fgsnhfr/Lightsabers.hs:1:53:
Not in scope: main' Perhaps you meant min' (imported from Prelude)

Also this kata is lame after already having completed https://www.codewars.com/kata/jennys-secret-message remove this kata or do something about the order in which kata's are offered.

(Haskell)

Return an array, where the first element is the count of positives numbers and the second element is sum of negative numbers.

When there are 0 element in the list then there are also 0 positive element. The first element to return is therefor 0. Since there are no negative numbers it can also not be summed and there is no second element. Given the return type of [Int] the best answer is [0] not []

There is no reason for the input type to be wrapped in Maybe.

The best type for the output is (Int, Maybe Int)

Input list should not be wrapped in a Maybe