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Improve section Advanced Stack Manipulation's examples.

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HorseMD 2014-11-13 00:19:20 +00:00
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@ -52,7 +52,7 @@ of what is written here should work elsewhere.
\ And so on.
\ ------------------------------ Stack Maniulation ------------------------------
\ ------------------------------ Stack Manipulation ------------------------------
\ Naturally, as we do so much work with the stack, we'll want some useful methods.
@ -63,10 +63,10 @@ of what is written here should work elsewhere.
\ ------------------------------ More Advanced Stack Manipulation ------------------------------
tuck \ acts like dup, except it duplicates the top item into the 3rd* position in the stack
over \ duplicate the second item to the top of the stack
n roll \ where n is a number, *move* the stack item at that position to the top of the stack
n pick \ where n is a number, *duplicate* the item at that position to the top of the stack
1 2 3 4 tuck \ duplicate the top item into the second slot: 1 2 4 3 4 ok
1 2 3 4 over \ duplicate the second item to the top: 1 2 3 4 3 ok
1 2 3 4 2 roll \ *move* the item at that position to the top: 1 3 4 2 ok
1 2 3 4 2 pick \ *duplicate* the item at that position to the top: 1 2 3 4 2 ok
\ When referring to stack indexes, they are zero-based.