Well in that case I wouldn't name the variable as "n". It doesn't mean anything and decreases the readability.

"f" would be cool, or better: "friend".

"Input strings will only contain letters."

How about the name with number ?

Great solution, thank you. I overcomplicated myself using .split("") and a condition but this is smart. Gotta remember about filter.

Names with numbers will be a trend .. apparently

Description says "a name has exactly 4 letters in it". Not numbers.

I've been reading a bit of prototypes but I still don't understand, let me explain

Seeing this solution I understand a bit, but when I want to use this method outside the codewars editor, then I don't know how it works

I only dislike "n" as a name. "N" doesn't say anything about what we are dealing with. It should be friendName or friend imo.

Nice one!

This soulution passed only basic test? bcs string from 4 numbers like '3333' is not a name)

Because the author doesn't mention it and everyone is lazy pretty much

Oh interesting! I like your solution.

some of us havent got to space/time complexity lol