Is there function like Collection::singleOrNull bu...

# stdlib

[PHondogo]

Is there function like Collection::singleOrNull but throws exception if there is more then 1 element matching selector? Current one is returning null for both 0 and >1 cases.

[asdf asdf]

.single()

[PHondogo]

.single() throws exception in case of 0 matches, but I need null in case of 0 matches

[jw]

Do a count{} and then check <= 1

[PHondogo]

I wonder if there is stdlib solution for this case.

[asdf asdf]

You could do collection.ifEmpty { null }?.single() otherwise i don’t think there’s a builtin way to do that

[PHondogo]

Any reason that this case is not implemented in stdlib?

[ilya.gorbunov]

Lack of a good name

[PHondogo]

singleOrNullIfNone?