.clear()

In Dart, the .clear() method removes all elements in the queue. After invoking this method, the queue will be empty, and its size will be zero.

The .clear() method is a (void) method that does not return any value and does not accept any arguments.

Syntax

To call the .clear() method and clear a queue named myQueue, the syntax is as follows:

myQueue.clear();

Note: To use a queue in a Dart program, it is necessary to import the dart:collection module.

Example

In the following example, a queue is created, elements are inserted in the queue and the .clear() method removes all elements in the queue:

import 'dart:collection';

void main()
{
  // Creating a queue
  Queue<int> myQueue = new Queue<int>();

  // Inserting elements in the myQueue
  myQueue.addAll([1, 2, 3, 4, 5, 6]);
  print("Queue before clearing: $myQueue");

  // removing all elements in the myQueue
  myQueue.clear();
  print("Queue after clearing: $myQueue");
}

The above code will result in the following output:

Queue before clearing: {1, 2, 3, 4, 5, 6}
Queue after clearing: {}