The solution itself is simple, the hard part is analyzing and finding the solution; look around, many people think like me, even in the solutions u can see ppl writing how hard it actually was. I solved easier 5kyu katas.

I focues on effeciency here; each character is visited exactly once.

this is clean bur ineffecient af

very cool!

Awesome kata! I never understood JS call & apply functions, until now :)

clean af! gg

Very nice kata! thanks!

That's awesome!

my eyes

clever af

roflmao

So clean! good job

Ha, interesting.