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Engineering LibreTexts

2.12: Nothing Data Type

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  • Overview

    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 Terms

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

    1. Wikipedia: Nullable type
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