peek_front.rdeque {rstackdeque} | R Documentation |
Simply returns the data element sitting at the front of the rdeque, leaving the rdeque alone.
## S3 method for class 'rdeque' peek_front(x, ...)
x |
rdeque to peek at. |
... |
additional arguments to be passed to or from methods (ignored). |
Runs in O(1)
worst-case time.
data element existing at the front of the rdeque.
without_front
for removing the front element.
d <- rdeque() d <- insert_front(d, "a") d <- insert_front(d, "b") e <- peek_front(d) print(e) print(d) ## Assigning to the front data element with peek_front: 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) print(d)