Do you guys know if there's any particular reason for `Char.isDigit` to not have it's opposite `Char...

# announcements

[LeoColman]

Do you guys know if there's any particular reason for Char.isDigit to not have it's opposite Char.isNotDigit?

[Alan Donizete]

maybe because we can do a !Char.isDigit ?

[LeoColman]

We always can

[LeoColman]

As we can with String.isEmpty, but we have a String.isNotEmpty

[LeoColman]

But as I observed, it's usual to have a negated version of booleans in the STDLib

[louiscad]

#C0B8Q383C

[Stephan Schroeder]

Negated predicates are of course nice for filtering (listOfStrings.filter(String::isNotEmpty) is slightly more readable than listOfStrings.filter {!it.isEmpty()}) but also pollutes the API a little bit (double functions). So I guess you'd create one of those is it is used "often".