VBS TUTORIAL: operator-comparison operator _vbs

Comparison operators

Used to compare expressions.

result = expression1 comparisonoperator expression2

Result = Object1 is Object2

Parameters

Result

Any number.

Expression

Any expression.

Comparisonoperator

Any comparison operator.

Object

Any object name.

Description

The IS operator has a special comparison feature that differs from the operator in the following table. The following table contains a list of comparison operators, and a condition that determines whether result is True, False, or Null.

operator	Description	True If	False if	Null If
<	Less than	expression1 < expression2	expression1 >= expression2	expression1 or expression2 = Null
<=	Less than or equal to	expression1 <= expression2	expression1 > expression2	expression1 or expression2 = Null
>	Greater than	expression1 > expression2	expression1 <= expression2	expression1 or expression2 = Null
>=	Greater than or equal to	expression1 >= expression2	expression1 < expression2	expression1 or expression2 = Null
=	Equals	expression1 = expression2	expression1 <> expression2	expression1 or expression2 = Null
<>	Not equal to	expression1 <> expression2	expression1 = expression2	expression1 or expression2 = Null

When you compare two expressions, you may not be easy to determine whether the comparison expression is either numeric or as a string.

The following table describes how to compare expressions and the results of comparisons, depending on the subtype of the comparison.

if	is
Two of expressions are numeric	performs numeric comparisons.
All two expressions are strings	Performs a string comparison.
An expression is a numeric value, plus an expression is a string	A numeric expression is less than a string expression.
One expression is Empty and the other is numeric	Performs a numeric comparison of 0 as the value of the Empty expression.
An expression is Empty and another expression is a string	Performs a string comparison with a 0-length string ("") as the value of the Empty expression.
All two expressions are Empty	Two expressions are equal.