VB keywords
VBScript Keywords
| Keywords | Description |
|---|---|
| Empty | is used to indicate an uninitialized variable value. When a variable is first created or when the variable value is explicitly set to null, the variable value is not initialized and the variable is not assigned a value. Example: Note: This is not the same as Null! ! |
| IsEmpty | is used to test whether a variable is not initialized. Example: If (IsEmpty(x)) 'Variable x is not initialized? |
| Nothing | is used to indicate an uninitialized object value, or to separate object variables from the object to release system resources. Example: Set myObject=Nothing |
| Is Nothing | is used to test whether a value is an initialized object. Example: If (myObject Is Nothing) 'Is it not set? Note: If you compare a value to Nothing, you will not get the correct result! Example: If (myObject = Nothing) 'Always wrong! |
| Null | is used to indicate that the variable does not contain valid data. Null sets the value to "invalid", and Empty means the value is "not set". Note: This is different from Empty or Nothing! ! Example: x=Null 'x does not contain valid data |
| IsNull | is used to test whether a value contains invalid data. Example: if (IsNull(x)) 'x is invalid? |
| True | Used to indicate that a Boolean condition is correct (True is -1) |
| False | Used to indicate that a Boolean condition is incorrect (False is 0) |
