The **`queue.first` function** in Dart is used to get the reference of the first element in the queue.

Figure 1 shows the visual representation of the `queue.first` function.

The following module is required in order to use the function `dart:collection`:

#   
#  Syntax

```dart
element queue_name.first
// where the queue_name is the name of the queue
```
# 
#  Parameter

This function does not require a parameter.
##
## Return value
The function `queue.first` returns the reference to the queue's first element.
>- It does not remove that element from the queue.
>- If the queue is `empty` then it throws an `error`.

##
## Code
The following code shows how to use `queue.first` function in Dart.

import 'dart:convert';
import 'dart:collection';
void main() {
  Queue<int> queue_1 = new Queue<int>();

  queue_1.add(1);
  queue_1.add(3);
  queue_1.add(5);
  queue_1.add(2);
  queue_1.add(0);
  //Queue filled= 1->3->5->2->0
  print("The elements of queue_1: ${queue_1}");
  print("The first element of queue_1: ${queue_1.first}");

}

What is the queue.first method in Dart?

The queue.first function in Dart returns the reference to the first element in a queue.