without_top | R Documentation |
Simply returns a version of the given stack without the top element. Results in an error if the structure is empty. The original rstack is left alone.
without_top(s, ...)
s |
rstack to remove elements from. |
... |
additional arguments to be passed to or from methods (ignored). |
Runs in O(1) time worst case.
version of the stack with the top n elements removed.
Okasaki, Chris. Purely Functional Data Structures. Cambridge University Press, 1999.
insert_top
for inserting elements.
s <- rstack() s <- insert_top(s, "a") s <- insert_top(s, "b") s <- insert_top(s, "c") s2 <- without_top(s) print(s2) print(s)
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