none! datatype represents a value that does not belong to any other datatype. It is analogous to nil or nothing in other programming languages.
None! is a member of the following typesets:
None values can be created using literal syntax, or at runtime using a
make constructor, or a
>> make none! 'x == none >> to none! 42 == none
3. Literal syntax
The predefined word
none or the serialized syntax:
4. Testing values
none? to check if a value is of the
>> none? 1 == false >> none? true == false >> none? none == true
type? to return the datatype of a given value.
>> type? none == none!
5. Predefined words