The **`set.contains()` function** in Dart is used to check if a set contains the specific element sent as a parameter. 
>`set.contains()` returns `true` if the set contains that element. Otherwise, it returns `false`. 

Figure below, ﻿shows a visual representation of the `set.contains()` function:

---
>In Dart, a **`set`** is a particular instance of a list in which all of the elements are unique.

> `dart:core` library is required in order to use this function.
---

>If there are duplicates, then the set will only keep the first instance/element. For example,
`{'Tom','Alsvin','Eddie','Tom'}` will result in `{'Tom','Alsvin','Eddie'}`.

#   
## Syntax

```dart
bool set_name.contains(element)
// where the set_name is the name of the set.
```
## Parameter

This function requires an `element` as a parameter.

## Return value

 The function returns a Boolean value, i.e., `true` if a specific element is present in a set or `false` if it is not present.

## Code
The code below shows how to use the `set.contains()` function in Dart:

import 'dart:convert';
import 'dart:core';
void main() {
  Set<String> set_1 = {'Tom','Alsvin','Eddie'}; 
  //set containing value 
  print("set_1 elements: ${set_1}");

  //set containing specific element
  print("Eddie is present in the set: ${set_1.contains('Eddie')}");

  //set not containing specific element
  print("Jack element is present in the set: ${set_1.contains('Jack')}");
  
}

What is the set.contains() method in Dart?

The set.contains() function in Dart checks if a set includes a specific element, returning true or false.