Dart allows users to manipulate data in the form of a queue.
A queue is a collection of objects. When you want to create a first-in, first-out data collection, queues come in handy.
forEach loopThe forEach loop is used to iterate over a queue.
When using a
queuein a Dart program, you must import thedart: collectionmodule.
queue_name.forEach((value))
queue_nameis the name of the queue.
The forEach loop requires a value to perform its iteration and returns all values present in the queue.
import 'dart:collection';void main() {// Creating a QueueQueue<String> fruits = Queue<String>();// Adding elements to the queuefruits.add('Mango');fruits.add('Pawpaw');fruits.addFirst('Apple');fruits.addLast('Pineapple');// Printing each element using forEachfruits.forEach((value)=> print(value));}
In the code above, we import the dart:collection library to utilize the Queue class, then create a Queue named fruits.
Next, we use the methods add(), addFirst(), and addLast() to add elements to the queue.
The queue_name.add(element) method is used to add the element in the queue.
The queue_name.addFirst(element) method inserts the element from the front inside the queue.
The queue_name.addLast(element) method adds the element from back in the queue.
Finally, each element in the queue is printed out using the forEach loop.