.contains()

The .contains() method in Dart checks if a specified element is present in the given queue.

Syntax

bool contains(Object element)

• element: It is the object that needs to be checked in the queue.

Example 1

In the following example, the code checks whether the queue contains an element 3 or not:

import 'dart:collection';

void main() {
  var queue = Queue();
  queue.addAll([1, 2, 3, 4, 5]);
  print(queue.contains(3));
}

The output of the above code is:

true

Example 2

The following example uses the ‘.contains()’ method to check if the name ‘Bob’ is present in the queue:

import 'dart:collection';

void main() {
  var names = Queue<String>();
  names.addAll(['Alice', 'Bob', 'Charlie', 'David']);
  print(names.contains('Bob'));
}

The output of the above is:

false