Deque (should be pronounced as "deck") is a collection implementing double-ended queues. Deques are similar to arrays, but they have efficient insertions and removal of elements at the beginning and at the end.
The indexing semantics are integer indices that are the same as arrays.
Now let's see a sample implementation of deque.
var colors: Deque = ["Yellow", "Orange"]
print(colors) // [Yellow, Orange]
The above code implements a deque of colors with the strings yellow and orange.
Deque operations
Now let's see some operations or methods unique to deques.
1. prepend - Adding an element at the beginning of the deque.
colors.prepend("Blue") // Blue is added to the beginning
2. append - Adding an element to the end of the deque.
colors.append("White") // White is added to the end
3. popFirst - Removal of an element from the beginning of the deque.
let _ = colors.popFirst() // Blue is removed
4. popLast - Removal of an element from the beginning of the deque.
let _ = colors.popLast() // White is removed
print(colors) // [Yellow, Orange]
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