IsBoolean(expression)

Calling Sequence:
IsBoolean(expression)
Parameters:
expression - an expression
Description:
IsBoolean returns True if the argument is of a boolean type. This means it has to be either True, False, or an expression involving functions that return a boolean result, like =, >, <, >=, <=, !=, And, Not, Or.
Examples:
In> IsBoolean(a)
Out> False;
In> IsBoolean(True)
Out> True;
In> IsBoolean(a And b)
Out> True;

See Also:
True , False , ,