NAME
SetZeroIfEmpty — Take variable and make it zero if it is empty.
SYNOPSIS
SetZeroIfEmpty VarName
DESCRIPTION
Return Value
The value that VarName now has.
Arguments
VarNameName of variable to possibly set to zero.

For information regarding exceptions / errors, see here.
EXAMPLES 
% set Nothing ""
% SetZeroIfEmpty Nothing
0
% puts $Nothing
0
% set Something "something"
something
% SetZeroIfEmpty Something
% puts $Something
something
SEE ALSO
IsEmpty, RetZeroIfEmpty
KEYWORDS
check, variable