How to create and maintain a fixed length queue in dart?

In Dart, you can create and maintain a fixed length queue using the ListQueue class from the dart:collection library. The ListQueue class implements a queue using a list, and you can set the maximum capacity of the queue using its constructor.

Here's an example of how to create and maintain a fixed length queue in Dart:

import 'dart:collection';

void main() {
  // Create a fixed length queue with a maximum capacity of 5.
  var queue = ListQueue(5);

  // Add some elements to the queue.
  queue.add(1);
  queue.add(2);
  queue.add(3);

  // Print the contents of the queue.
  print(queue); // Output: (1, 2, 3)

  // Add more elements to the queue to exceed its maximum capacity.
  queue.add(4);
  queue.add(5);
  queue.add(6);

  // Print the contents of the queue again.
  print(queue); // Output: (2, 3, 4, 5, 6)

  // Remove an element from the queue.
  queue.removeFirst();

  // Add another element to the queue.
  queue.add(7);

  // Print the contents of the queue again.
  print(queue); // Output: (3, 4, 5, 6, 7)
}

In this example, we create a ListQueue with a maximum capacity of 5 by passing 5 as an argument to its constructor. We then add some elements to the queue and print its contents.

Next, we add more elements to the queue to exceed its maximum capacity. The oldest element is automatically removed from the queue to maintain its fixed length.

Finally, we remove an element from the queue, add another element, and print its contents again. The queue continues to maintain its fixed length of 5 elements.

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