Programming Fundamentals/Nothing Data Type


A nothing data type is a feature of some programming languages which allow the setting of a special value to indicate a missing or uninitialized value rather than using the value 0 (zero).[1]


Most programming languages support the use of a reserved word or words to represent missing, uninitialized, or invalid values.

Language Reserved Word Meaning
C++ null no value
C# null no value
Java null no value
JavaScript null no value
JavaScript NaN Not a Number
Python None no value
Swift nil no value

Key TermsEdit

Reserved word used to indicate a non-numeric value in a numeric variable.
Reserved word used to represent a missing value or invalid value.