in many languages input arguments are normal and understandable. But for Typescript test and inputs are different and strange. why?

I Should have just messed with the traits and mutability, nice though!

I think that all the language tools should be allowed

i would have thought the arrow function would be better practice but seems not by way of vote, anyone keen to explain?

ah sorry, first timer. noted.

can anyone tell me?? how to do arrayDiff

This kata definition should add an additional restriction for not using built-in language functions ? for example for php there is a array_diff function. Idk if this restriction is more oriented to the spirit of the kata.

I tried 8 if i'm right, lowest difficulty

I'm a bit lost on the website. I bought a book on python, I read the first half so far but I can't access my book until tomorrow so I guess I'm stuck for now...
The objectives looked simple, like sort letters by alphabetic order or return the middle of a word but I can't do that (I hope I can add "yet").
Thank you, that does help me a lot

Do some free courses elsewhere until you're confident enough to solve some problem without having to look up how to write what you need, start by doing 8 and 7 kyu (the lower the number, the harder the kata) katas and only then go up in the ladder.

Make sure you read the CW Docs: https://docs.codewars.com/

If a value is present in b, all of its occurrences must be removed from the other

0 and -19 are present in b, so they aren't included in the output.