Description:
Returns a boolean value - specifies whether a variable has been initialized.
In the PROMOTIC system it is better to use the Pm.IsValid method (or Pm.GetVarType).
Syntax:
Boolean IsEmpty(Variant expression)
Parameters:
| expression | (Variant) Any valid expression. However, because function is used to determine if individual variables are initialized, the expression parameter is most often a single variable name. |
|---|
Return value:
true - If the variable is uninitialized, or is explicitly set to Empty.
false - Otherwise. false is always returned, if expression contains more than one variable.
Example:
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Dim Val, bCheck
bCheck = IsEmpty(Val)
' Returns true
Val = Null
bCheck = IsEmpty(Val)
' Returns false
Val = Empty
bCheck = IsEmpty(Val)
' Returns true