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kotlinlang

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

maybe because we can do a !Char.isDigit ?

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

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

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".