It's complicated:

The expression x or y first evaluates x; if x is true, its value is returned; otherwise, y is evaluated and the resulting value is returned.

But in your case it is not important what 'x' or 'X' does exactly. The important part is to figure out the thing you need to do, which is: how to figure out whether a letter is 'x' or 'X'.

Can you please explain me a bit, as to what it does?

The 'x' or 'X' does not work the way you want it to work, this syntax does something else.

wtf is this

JavaScript:

• intial code should be a class
• should be upgraded to Node 18+ and chai assertions

C translation (author inactive), also made the description language-agnostic

While fair critique is fine, and often deserved, you should really try to find better language to express it.

Also what exactly is wrong with long strings here?

Merged

Approved

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Now it´s working, to be fair I don´t know what I change, but now its working!.

It is not a problem with the kata.