peek_front<- {rstackdeque} | R Documentation |
Allows modification access to the front of a deque or queue.
peek_front(x, ...) <- value
x |
rdeque or rpqueue to modify the front element of. |
... |
additional arguments to be passed to or from methods. |
value |
value to assign to the front data element. |
Runs in O(1) worst case time. Throws an error if the deque is empty.
modified rdeque or rpqueue.
d <- rdeque() d <- insert_front(d, data.frame(a = 1, b = 1)) d <- insert_front(d, data.frame(a = 1, b = 1)) peek_front(d)$a <- 100 print(d) peek_front(d) <- data.frame(a = 100, b = 100) q <- rpqueue() q <- insert_front(d, data.frame(a = 1, b = 1)) q <- insert_front(d, data.frame(a = 1, b = 1)) peek_front(q)$a <- 100 print(q) peek_front(q) <- data.frame(a = 100, b = 100)