VBS Tutorial: function-IsEmpty Function

IsEmpty Function

Return a Boolean value to indicate whether the variable has been initialized.

IsEmpty (Expression)

ExpressionThe parameter can be any expression. HoweverIsEmptyUsed to determine whether a variable has been initialized.ExpressionA parameter is often a variable name.

Description

If the variable is not initialized or explicitly set to Empty, the functionIsEmptyReturnTrueOtherwise, the function returnsFalse. IfExpressionContains more than one variable and always returnsFalse.

The following example usesIsEmptyThe function determines whether the variable can be initialized:

Dim MyVar, MyCheckMyCheck =IsEmpty (MyVar)'ReturnTrue.MyVar = null'AssignedNull.MyCheck =IsEmpty (MyVar)'ReturnFalse.MyVar = Empty'AssignedEmpty.MyCheck =IsEmpty (MyVar)'ReturnTrue.