Clever use of the Set equals method.

Here is a TypeScript translation for review: https://www.codewars.com/kumite/61ae28da87f3400033383e2f?sel=61ae28da87f3400033383e2f

I made the first change (size in the ArrayList constructor). I'm not too worried about the second change, since this code isn't seen by the user. It's just to verify the tests are correct.

The should contain ORDER BY species test is a little overly zealous. Most databases (including PostgreSQL) support ordering by the column number. So ORDER BY 6 would be valid (if column order can be guaranteed), as well as ORDER BY species.

That is not the definition of Camel Case. If you want to restrict your definition to lower case letters first then you should clarify "lower camel case". However, "camel case" is by definition ambiguous.

https://en.wikipedia.org/wiki/Camel_case

There are no test cases for strings that start with a capital letter. (e.g. "CamelCase")

I would assume such an input should produce "Camel Case", but most of the current solutions (including the author's original) produce " Camel Case".

Java translation for review

I don't think it matters much in this context, but I would consider it a best practice to prevent a) use where it shouldn't be used, and b) accidental re-use of the same variable name.

I should have used let (block scope) instead of var (function scope).