guys ours looks the best 😎

I understand, thank you for the explanation!

Is there any difference between importing the library first opposed to doing Math.abs() ?

It is not best practice. The same people that go on leetcode that demands more of them and then downvote the problem come here to do their shenanigans and upvote the clever answers and call them a best practice. Bunch of 12 year olds.

In this particular case it doesn't make sense.
Probably author had to cast while developing the solution and then forgot to remove it during final refactoring.

I agree. it's not best practise, but it is clever :)

The tests internally use floats instead of doubles which can lead to failing random tests.
It's easy to fix, see the issue by @kayakero

I don't think it's the best practice. It's less code, however, it's much more resource consuming than a simple condition.