head.rdeque: Return the first n elements of an rdeque as an rdeque

In rstackdeque: Persistent Fast Amortized Stack and Queue Data Structures

Description

Returns the first n elements of a deque as a deque, or all of the elements if its length is less than n.

Usage

## S3 method for class 'rdeque'
head(x, n = 6L, ...)

Arguments

x	rdeque to get the head of.
n	number of elements to get.
...	arguments to be passed to or from other methods (ignored).

Details

Runs in O(n) time (in the size of the number of elements requested).

Value

a new rdeque.

Examples

d <- rdeque()
d <- insert_back(d, "a")
d <- insert_back(d, "b")
d <- insert_back(d, "c")

dt <- head(d, n = 2)
print(dt)

rstackdeque documentation built on May 2, 2019, 4:15 a.m.