Unset? - Function Summary

Summary:

Returns TRUE for unset values.

Usage:

unset? value

Arguments:

value - The value argument. (must be: any-type)

Description:

Returns TRUE if a value is UNSET. Normally you should use VALUE? to test if a word has a value.

if unset? do [print "test"] [print "Nothing was returned"] test

Related:

value? - Returns TRUE if the word has been set.