Is there an equivalent of Nil
for Set
in scala?
I tried using Nil
as a value for Set
, but I got an error (expected since the type of Nil
is List
)
Thanks
Set.empty
is that set; although you can't get at it directly, it turns out that it is just a private object in the Set
companion object (called, obviously enough, EmptySet
). All that Set.empty
does is return that set with a cast to the correct type.
It is done this way, instead of with Nil
, because sets are invariant in their parameters. Nil
is List[Nothing]()
, but you couldn't add anything to a Set[Nothing]()
.
If you need to specify the type of your empty set, you can use e.g. Set.empty[String]
.
You can use Set.empty
or simply Set()
.
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