peek_front: Return the data element at the front of an rdeque

Description

Simply returns the data element sitting at the front of the deque, leaving the deque alone.

Usage

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Arguments

x

rdeque to look at.

...

additional arguments to be passed to or from methods (ignored).

Details

Runs in O(1) worst-case time.

Value

data element at the front of the rdeque.

Examples

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d <- rdeque()
d <- insert_front(d, "a")
d <- insert_back(d, "b")
e <- peek_front(d)
print(e)
print(d)

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