After seeing this solution, i learned that, in contrast to BST in other languages, BST(Set) in javascript can hold its insertion order.
This solution is clean and stable.

This is the best practices in my opinion. but...string is iterable , dont need convert to array.

unpowerful

I don't like this solution because you are mutating the function argument.

Works but O(n log n) instead of the simple solution with O(n)

great job!

is there a reason you decided to 's' into an array, instead of just looping through the string?

I think it's both important to know how to make your own function, AND what tools already exist to get the job done.

You don't need to reinvent the hammer every time you want to build a fence.

powerful

This is the best in my opinion. This has the best readability apart from all others above.

The same way of what I did, but with the shorter way! nice job!!

This is clever and nice use of recurssion.

🚀 nice job!

Code like this is the reason I scroll through here -- code that makes me aware of new things!
Thanks, "cheater"!

Knowing what tools are available is extremely valuable when building real world applications.
And not everyone knows about this library, so I believe this is valuable for people to see.