forth3/forth.f at main · s3e8/forth3 · GitHub

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: if immediate
    ' 0branch ,
    here @
    0 ,
;

: then immediate
    dup
    here @ swap -
    swap !
;

: else immediate
    ' branch ,
    here @
    0 ,
    swap
    dup
    here @ swap -
    swap !
;

: recurse immediate
    ' call ,
    latest @
    >cfa ,
;

: begin immediate
    here @
;

: until immediate
    ' 0branch ,
    here @ -
    ,
;

: again immediate
    ' branch ,
    here @ -
    ,
;

: while immediate
    ' 0branch ,
    here @
    0 ,
;

: repeat immediate
    ' branch ,
    swap
    here @ - ,
    dup
    here @ swap -
    swap !
;

: hello1 1 if 3 . then 4 . ;
: hello2 1 if 3 . then 4 . ;

hello1
hello2