Table of Contents
None represents "no useful value" or "no result". It’s used as a sentinel/placeholder/dummy value, for three-valued logic, and as a function result to indicate failure.
None! is a member of the following typesets: immediate!
None values can be created using literal syntax, or at runtime using a make constructor, or a to conversion.
>> make none! 'x == none >> to none! 42 == none
Use none? to check if a value is of the none! datatype.
>> none? 1 == false >> none? true == false >> none? none == true
Use type? to return the datatype of a given value.
>> type? none == none!