Overview of Forth

• Forth maintains a list of words, or a dictionary.

words
WORD           WORDS          FIND           '              [']
[              ]              CREATE         DOES>          >BODY
FORGET         COLD           ALLOT          ?ALLOT         LITERAL
EVALUATE       IMMEDIATE      CONSTANT       FCONSTANT      VARIABLE
FVARIABLE      CELLS          CELL+          CHAR+          DFLOATS
DFLOAT+        SFLOATS        SFLOAT+        ?              @
!              2@             2!             A@             C@
C!             W@             W!             F@             F!
DF@            DF!            SF@            SF!            SP@
RP@            >R             R>             R@             2>R
2R>            2R@            ?DUP           DUP            DROP
SWAP           OVER           ROT            -ROT           NIP
TUCK           PICK           ROLL           2DUP           2DROP
2SWAP          2OVER          2ROT           DEPTH          BASE
BINARY         DECIMAL        HEX            1+             1-
2+             2-             2*             2/             DO
?DO            LOOP           +LOOP          LEAVE          UNLOOP
I              J              BEGIN          WHILE          REPEAT
UNTIL          AGAIN          IF             ELSE           THEN
CASE           ENDCASE        OF             ENDOF          RECURSE
BYE            EXIT           QUIT           ABORT          ABORT"
...