(definition)

**Definition:**
A *function* that takes no arguments.

**Also known as** nullary function.

**See also**
*constant function*, *unary function*, *binary function*, *n-ary function*.

*Note:
Pronounced "zero-airy". By analogy to unary, binary, etc. *

* A 0-ary or nullary function that is pure (no state or interactions with external variables) must be a constant function.*

Author: PEB

Go to the Dictionary of Algorithms and Data Structures home page.

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Entry modified 17 December 2004.

HTML page formatted Mon Nov 18 10:44:10 2013.

Cite this as:

Paul E. Black, "0-ary function", in
*Dictionary of Algorithms and Data Structures* [online], Vreda Pieterse and Paul E. Black, eds. 17 December 2004. (accessed TODAY)
Available from: http://www.nist.gov/dads/HTML/zeroaryfunc.html