That expression is similar to split('')

you have no shame if you ask this under this solution.

w.o running the code, it's probably b.c you didn't split the, into characters and kept them and full strings.... but I'm still pretty new at coding.

you cant use a + on strings, you need to concat

Oh, okay, you can use the rest parameters so as not to duplicate the array.

Thank you!

Wow! Your decision is great! Thanks for it!

map returns whatever you return

I didn't know that map returns 0/1 instead false/true.

Your decision is very cool!

It does work, any test/s not passing?

argument has a different name - you should change array.length to A.length