What is Queue?
A Queue is a linear structure which follows a particular order in which the operations are performed. The order is First In First Out (FIFO). A good example of a queue is any queue of consumers for a resource where the consumer that came first is served first. It takes constant time to add or remove an element in a queue.
Queues should be used over arrays when we need to work with data in the FIFO form.
Dequeue Operation in Queue: In Queue, accessing the content while removing it from the front end of the queue, is known as a Dequeue Operation.
Approach: A Dequeue operation may involve the following steps:
- Checks that the queue is empty or not. If the queue is empty then it produces an error and exit.
- If the queue is not empty then accesses the data element at which front end is pointing.
- Delete the element, using array.pop() operation on buffer.
- Return success.
Example 1: This example implements enqueue operation to create a queue.
After Executing two Dequeue Operations by calling queue1.dequeue() function, the front value changes to 3.
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