When should I use the HashSet type?

Question

I am exploring the HashSet type, but I don\'t understand where it stands in collections.

Can one use it to replace a List

Answer 1

Performance would be a bad reason to choose HashSet over List. Instead, what better captures your intent? If order is important, then Set (or HashSet) is out. If duplicates are permitted, likewise. But there are plenty of circumstances when we don't care about order, and we'd rather not have duplicates - and that's when you want a Set.