hmmm ok, thanks, has sort method stability been fixed in more recents node versions tho ? Why am I having the right answer in my VScode ?

thanks guys !!!
I forgot the return before the recursiv call of my function. Not sure to understand yet why it's needend though, since there is a return in the if condition that should be call at the end of the recursion. Anyway, I won't forget the return before recursiv call in the future. And thanks for the tip about the global var, it was just a patch to prevent infinite recursion.

Thanks again and have a nice day ;)