Example Void isNull 001




These examples determine if the argument is equal to the value of the Void Data Type.



(isNull 1 ) Returns: false
(isNull #void ) Returns: true

An uninitialized variable has the value of #void..

(isNull x ) Returns: true


Related Examples

Here are examples of the isNull function at work.

Number isNull 001 Void isNull 001


Function Links

Here is the link to the current function used in this example.


Here are a number of links to other related functions.

isType(#void) isZero(#void)


Argument Types

Here are the links to the data types of the arguments used in this example.


Here are a number of links to examples having similar argument types.

Boolean methodsOf 012 Date isDate 001 Error isIdentical 007 String string 001
String string 002 String string 003 Void addMethod 009 Void addMethod 010
Void compareGE 008 Void compareLE 008 Void compareLT 008 Void comparison functions 008
Void defmethod 010 Void defmethod 011 Void isEqual 006 Void isIdentical 006
Void isNull 001 Void isType 010 Void methodsOf 011 Void ref 017
Void send 009 Void setq 015 Void sizeof 008 Void type 011

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