IsNull

The IsNull function is only supported in Studio. It returns true, if the argument is Undefined or its value is 'null'.

Prototype

    IsNull(Param)

Arguments

    Param                   variable, attribute value, table field, etc.

    A valid param; it can be a variable, an attribute value, a table field,
    etc.

Returns

    Boolean

    True if the argument is null

Example

    IsNull($Var)

This will return true if the variable is null or undefined.