| Word Name |
Word Type |
Data Stack Signature |
Return Stack Signature |
Description |
Availability |
| V1.0 |
V1.1 |
V1.2 |
|
.S
|
S |
-- |
-- |
Non-destructively displays the contents of the stack.
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?DUP
|
S |
a -- a | a a |
-- |
Duplicates the topmost item if it is not 0.
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><
|
S |
n -- n |
-- |
Swaps bytes in a cell. E.g. 0x1234 becomes 0x3412.
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2DROP
|
S |
a b -- |
-- |
Discards the topmost two cells.
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2DUP
|
S |
a b -- a b a b |
-- |
Duplicates the topmost two cells. |
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DEPTH
|
S |
-- depth |
-- |
Places the count of the number of cells on the stack on the stack.
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DROP
|
S |
n -- |
-- |
Discards the topmost cell.
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DUP
|
S |
n -- n n |
-- |
Duplicates the topmost cell.
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NIP
|
S |
a b -- b |
-- |
Discards the second cell (cell a). Equivalent to SWAP DROP.
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OVER
|
S |
a b -- a b a |
-- |
Copies the second cell to the top. 1 2 becomes 1 2 1.
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PICK
|
S |
n – Nth |
-- |
Copies stack cell number n to the top of the stack.
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ROLL
|
S |
+n -- n |
-- |
Rolls the stack left +n items. Items rolled out to the left wrap around to the top of the stack.
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ROT
|
S |
a b c -- b c a |
-- |
Rotates the top 3 items to the left. The 3rd item rotates into the top position. 1 2 3 becomes 2 3 1.
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-ROT
|
S |
a b c -- c a b |
-- |
Rotates the top 3 items to the right. The topmost item rotates into the 3rd position. 1 2 3 becomes 3 1 2.
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SWAP
|
S |
a b -- b a |
-- |
Swaps the topmost two cells. 1 2 becomes 2 1
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TUCK
|
S |
a b -- b a b |
-- |
Copies the top cell into the 3rd position, moving the stack forward. 1 2 becomes 2 1 2.
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