411 REFERENCE · Wikibooks
Rebol Programming/unset?
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
USAGE:
UNSET? value
DESCRIPTION:
Returns TRUE for unset values.
UNSET? is an action value.
ARGUMENTS
value -- (Type: any-type)
SOURCE CODE
unset?: native["Returns TRUE for unset values." value [any-type!] 1]