Merged.

CoffeeScript translation

Repeated characters are to be ignored and non-alphebetic characters as well.

There should be fixed tests for that and currently, at least for javascript, the control function fails for a string with numbers in it (currently, not tested).

Updated JavaScript

• Updated to Node 18
• Uses chai

nice kata

Approved!

Python update (new testing framework)

my brain can't handle the creativity i had to use to not use the keys method ;p

There should be fixed tests with non-alphabetical strings to prevent solutions doing {... for char_ in input_string if ...} or None

duplicate issue

Aliasing a built-in is a worthless practice.

Haskell : https://www.codewars.com/kumite/5be8d9782635535c1b000113?sel=5be8d9782635535c1b000113

(the data type use is a very basic form of hash/lookup table for Haskell)

Took me actually longer figuring out what to do than writing the solution...

Returning inconsistent datatypes is not a best practice. Also, it is undefined if a non-empty string with only non-alphabetic characters is to return null or {}.

The JavaScript description uses non-JS language.

Not satisfied. :/