Yet another brilliant one-liner

Nice one liner lol

So great!!!!

the haha deserves 100 best practices minimum

This way is intuitive if you have the stomach to alter the concatenation template.

My one-liner managed to be just a smidge shorter though neither are really good practices.

I should go for these function equalities more

genius)

Here is our hero

Very clever use of short-circuit evaluation (&&). This makes sure that one never tries to access the array at the illegal argument (position) length(arr)+1. Great job.

seems the best practice is using O(n^2) instead of O(n) - leaving room for the future development :-)

Very clever

You have the same result wihtout the second line.
I wanted to see n when I wrote the code.

And why the second line?

Just had to set the recursion limit on a huge nomber and it worked for me :)