BUILT-IN WOLFRAM LANGUAGE SYMBOL
is a symbol used to indicate the absence of an expression or a result. It is not displayed in ordinary output.
When Null appears as a complete output expression, no output is printed.
- e1;e2;…;ek; returns Null, and prints no output.
- Expressions like f[e1,,e2] are interpreted to have Null between each pair of adjacent commas.
- Null represents the absence of content or elements in such constructs as InputField or Grid.
When a sequence of commands ends with a semicolon, no output is shown:
The full form of the output is Null:
If you forget a semicolon in a program you may see output with Null in it:
This is because the whitespace is interpreted as multiplication. Redefine with a semicolon:
Introduced in 1988
| Updated in 2007