Forget

This is an alternative to mark.

As a byproduct you get hide which hides a word from later dictionary search.

~~~:d:exists? d:lookup n:zero? ; 'abort d:exists? [ 'example/Abort.forth include ] if 's:(evaluate) d:exists? [ 'example/EvaluateString.forth include ] if ~~~

EOC (end-of-code)

~~~:d:size (-) #0 [ d:name drop #1 + ] d:for-each ;   :d:words.last (n-)     &Dictionary swap [ fetch dup d:name s:put sp d:link ] times drop ;   :EOC (-) 'EOC_(end-of-code) s:shout     d:size '%n_words_defined s:format s:put nl     #4 [ '%n_last_defined_words: s:format s:put sp ] sip d:words.last listen ;   ~~~

d:hide

~~~{{     'This 'Newer [ var ] bi@     :names-match? (a-f) d:name here s:eq? ;     :word-exists?continue (s-s) [ dup d:lookup ] assert ;     :d:newer-older (s-aa)_newer_older word-exists?continue       here s:copy d:last #0 !Newer [ dup names-match?       [ @Newer TRUE ] [ dup !Newer d:link fetch FALSE ] choose       ] until (this_newer) swap d:link fetch (older) ;     :exist?continue (aa-aa) [ dup-pair [ n:-zero? ] bi@ and ] assert ;   ---reveal---     :d:newer (s-a) d:newer-older drop ;     :d:hide (s-) d:newer-older exist?continue swap d:link store ;   }}   ~~~

```:a ; :b ; :c ;   'b d:hide   '#5_d:words.last s:(evaluate)   ```

Forget

~~~:d:forget.a (a-) dup n:-zero? [ dup !Heap d:link fetch !Dictionary ]     [ drop 'tried_to_d:forget_a_word_that_doesn't_exist. s:shout ] choose ;   :d:forget (s-) d:lookup d:forget.a ;   :f:reset (-|float:?-) f:depth [ f:drop ] times ;   :reset.nf (?-|float:?-) reset f:reset ;   :d:wipe (-) reset.nf '---wipe--- d:newer d:forget.a ;   ~~~

:---wipe--- ; :a ; :b ; :c ; nl '#5_d:words.last s:(evaluate) d:wipe nl '#5_d:words.last s:(evaluate) nl