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For further information see: http://www.winguides.com/scripting
IsArray() - Check for Valid Array
The IsArray() function checks whether the supplied expression is a valid array and return true or false.
IsDate() - Date Validity Check
The IsDate() function checks whether the supplied expression is a valid date string and returns either true or false.
IsEmpty() - Checks for Empty or Uninitialized Variables
The IsEmpty() function checks whether the supplied variable has been initialized or set to empty and returns either true or false.
IsNull() - Checks for Blank or Null Variables
The IsNull() function checks whether a variable has any valid data or whether it is blank or Null.
IsNumeric() - Numeric Data Check
The IsNumeric() function checks whether the supplied expression is a valid numeric value and returns either true or false.
IsObject() - Checks for a Valid Object
This IsObject() function checks whether the supplied expression references a valid object.
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