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The semantics of Null are very poorly understood, particularly amongst people who have little experience with programming. To check to see if an object reference is invalid, use: If varValue Is Nothing Then Is doomed to failure Nothing does not have a default property, so this will produce a run-time error. Since the equality operator on objects checks for equality on the default property of an object, any attempt to say: If varValue = Nothing Then If Empty says “I am an uninitialized variant,” Nothing says “I am an object reference that refers to no object.” Objects are assigned to variables using the Set statement. Nothing is similar to Empty but subtly different. For those who know Visual Basic, it is an added advantage. This is not a very difficult language to learn and with a little knowledge of basic programming skills and passion for writing code, anyone can learn this easily. Alternatively, you could use TypeName or VarType, but IsEmpty is best. VBScript language is used in QTP for coding and running Automated Test Scripts. So basically, Empty says “I am an uninitialized variant.” If you need to detect whether a variable actually is an empty variant and not a string or a number, you can use IsEmpty. When you declare a variable in VBScript, the variable’s value before the first assignment is undefined, or Empty. Why does VBScript have Null, Nothing and Empty, and what are the differences between them? Empty
#VISUAL BASIC SCRIPT CODE#
Usually they’ve written code something like: If varValue = Nothing Then There has always been confusion about the semantics of data that are not even there. This guide discusses what nothing means in VBScript.