Can you list the main types of queues used in programming?

In programming, the main types of queues that are commonly used include:

• FIFO (First In, First Out) — a classic queue where elements are processed in the order they arrive.
• LIFO (Last In, First Out) — a stack where the last added element is removed first.
• Priority queue — elements are removed based on their priority rather than the order of addition.
• Deque (Double-Ended Queue) — allows adding and removing elements from both ends.

In iOS, GCD (Grand Central Dispatch) queues are often used for task management:

• Serial queue — tasks are executed one at a time.
• Concurrent queue — tasks can be executed simultaneously.

Example of creating and using a serial queue in Swift:

let serialQueue = DispatchQueue(label: "com.example.serialQueue")
serialQueue.async {
    print("Executing task 1")
}
serialQueue.async {
    print("Executing task 2")
}