This command is new in newRPL, does not exist in userRPL.
+
The ''STKDROP'' command deletes the snapshot on the top of the Undo stack and subsequently all remaining snapshots drop one place.
+
+
The command has little utility in interactive mode, because before ''STKDROP'' is executed a snapshot of the stack is pushed on the Undo stack: the only effect of ''STKDROP'' would be to delete the copy that was just made, leaving the Undo stack unchanged (except for the fact that its level 8 would have been lost in the process).
This command is new in newRPL and does not exist in userRPL.
</callout>
</callout>
<callout type="info" icon="true" title="Usage">
<callout type="info" icon="true" title="Usage">
----
----
-
The following program:
+
The following program
<code>
<code>
-
« 123
+
« "ABC"
+
STKPUSH
+
CLEAR
+
123
456
456
789
789
Line 35:
Line 45:
999
999
STKDROP
STKDROP
+
STKPOP
»
»
</code>
</code>
-
A snapshot containing numbers 123, 456, 789 will be pushed onto the "stack of stacks", then removed from the stack with ''CLEAR''. Finally, the snapshot will be removed from the "stack of stacks".
+
creates the following stack (before ''STKDROP'' is executed)