1.6 KiB
1.6 KiB
Forth to RETRO Cross Reference
This is a quick overview of some differences between RETRO and traditional Forth.
| Category | Forth | RETRO |
|---|---|---|
| Definitions | : name ; |
:name ; |
| Numbers | 100 -12 |
#100 #-12 |
| Characters (interpret) | CHAR A CHAR D |
$A $D |
| Characters (compile) | [CHAR] A [CHAR] D |
$A $D |
| Comments | ( This is a comment ) |
(This_is_a_comment) |
| Pointers (interpret) | ' Compiler |
&Compiler |
| Pointers (compile) | `['] Compiler | &Compiler |
| Conditionals #1 | IF 1 THEN |
[ #1 ] if |
| Conditionals #2 | NOT IF 1 THEN |
[ #1 ] -if |
| Conditionals #3 | IF 1 ELSE 2 THEN |
[ #1 ] [ #2 ] choose |
| Counted Loops | 10 0 DO LOOP |
#10 [ ] times |
| Counted Loops w/Index | 10 0 DO I LOOP |
#10 [ I ] times<with-index> |
| Unconditional Loops | BEGIN AGAIN |
repeat again |
| Return Stack | 10 >R ... R> |
#10 push ... pop |
RETRO conditionals and loops can be used outside of definitions, ANS ones can not.
Some forms are replaced by combinators.
FORTH
>R ... R> [ ... ] dip
DUP >R ... R> [ ... ] sip