I like this solution! :D like mine... but mine definetly uglier

btw, how do you colaberate with other people?

oh.

It emphasizes the algorithmic side of a problem.

but then i wonder, why would a code that causes recursion be considered good(clever, and best practice)? In a part of a book i read, it condemns code like this.

For really long strings it would. Also, all those slices would be slow for long strings.

The mechanics of this code is genious! but would not this cause stack overflow ?? pls elaborate thx

thanks for explaining~ you're awesome<3

Arrays are objects, too, hence why it works. In general though, best practices are to use arrays only for consecutive numeric keys. This is because browsers can optimize for that scenario (e.g. using a real C++ array).

If you're thinking of associative arrays, javascript's closest equivalent is the object. However, objects differ in implementation from pure maps, so when Ecmascript 6 comes along, we should probably start using Map for these things.