All Functions
IsEmpty Function
IsNull Function
IsNumeric Function
KEYWORDS: Empty, False, New, Nothing, Null, True
Implemented in version 1.0
Empty
The
Empty
keyword is the value that a variable is automatically assigned when it is declared using the
Dim
statement. It is important to understand that this means that a declared variable does have a value,
Empty
, even if you have purposely not assigned a value in your code.
You can test whether a variable is empty using the
IsEmpty
function. Also,
Empty
is not the same as
Null
or
Nothing
.
False
The
False
keyword has the value of 0. You can use that value as a basis for testing in conditional statements.
New
The
New
keyword is used in conjunction with
Set
to create an instance of a
Class
or a
RegExp
. First, using
Dim
, you must declare the name of the variable that the instance will be assigned. Then, you can create the instance.
Code:
<%
Dim SearchPattern
Set SearchPattern = New RegExp
%>
Nothing
The
Nothing
keyword is used to disassociate an object variable from an object. If several object variables refer to the same object, all must be set to
Nothing
before system resources are released.
You must assign
Nothing
using the
Set
keyword.
Code:
<% Set YourObject = Nothing %>
Null
The
Null
keyword indicates that a variable contains no valid data. You can assign a variable the value of
Null
and use the
IsNull()
function to test whether a variable is
Null
. If you print the variable out, the output should be
Null
.
Also,
Null
is not the same as
Empty
or
Nothing
.
True
The
True
keyword has the value of -1. You can use that value as a basis for testing in conditional statements.
Copyright 1999-2004 by Infinite Software Solutions, Inc. All rights reserved.
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