##    
### Overview
The **`contains` method** in Kotlin checks whether a HashSet contains a specific value.

### Syntax

```kotlin
fun contains(element: E): Boolean
```

##
### Parameters

* **`element`**: This represents the value whose presence we want to check inside the HashSet.

##
### Return value

This method returns `true` if the passed value is present inside the HashSet. It returns `false` if the value is not present inside the HashSet.

##
### Example

The code snippet below demonstrates how to check for the existence of a value inside a HashSet using the `contains` method.

fun main() {
  //Creating a new HashSet that can have integer types as elements
  var set: HashSet<Int> = hashSetOf<Int>()

  // Adding four entries
  set.add(1)
  set.add(2)
  set.add(3)
  set.add(4)
  
  println("\nThe set is : $set")
  
  // Checking if the set contains the element 1
  println("\nset.contains(1) :" + set.contains(1));

  // Checking if the set contains the element 5
  println("\nset.contains(5) :" + set.contains(5));

}

### Explanation

* Line 3: We create a new HashSet object named `set`. We use the `hashSetOf()` method to create an empty HashSet.

* Lines 6–9: We add four new elements `1`, `2`, `3`, and `4` to `set` using the `add()` method.

* Line 14: We use the `contains` method to check if `set` contains the element `1`. The element `1` is present in `set`, so the method returns `true`.

* Line 17: We use the `contains` method to check if `set` contains the element `5`. The element `5` is not present in `set`, so the method returns `false`.

How to check if a HashSet contains an element in Kotlin

Overview

Syntax

Parameters

Return value

Example

Explanation