EMPTYP thing EMPTY? thing
thing
Outputs TRUE if thing is either the empty string or the empty list, FALSE otherwise.
SHOW EMPTYP "Hello false
SHOW EMPTYP "Hello
SHOW EMPTYP " true
SHOW EMPTYP "
SHOW EMPTYP [1 2 3] false
SHOW EMPTYP [1 2 3]
SHOW EMPTYP [] true
SHOW EMPTYP []