C# | Check if a HashSet is a superset of the specified collection
Sure, here’s an example code that demonstrates using the IsSupersetOf method to check if a HashSet<string> is a superset of a List<string> and then printing out a message indicating the result:
C#
using System; using System.Collections.Generic; public class Program { public static void Main() { // create a HashSet of strings HashSet< string > set = new HashSet< string > { "apple" , "banana" , "cherry" , "date" }; // create a List of strings to check against the HashSet List< string > list = new List< string > { "apple" , "banana" }; // check if the HashSet is a superset of the List bool isSuperset = set .IsSupersetOf(list); // print out a message indicating the result if (isSuperset) { Console.WriteLine( "The HashSet is a superset of the List." ); } else { Console.WriteLine( "The HashSet is not a superset of the List." ); } } } |
The HashSet is a superset of the List.
A HashSet is an unordered collection of the unique elements. It comes under System.Collections.Generic namespace. It is used in a situation where we want to prevent duplicates from being inserted in the collection. As far as performance is concerned, it is better in comparison to the list. HashSet<T>.IsSupersetOf(IEnumerable) method is used to check whether a HashSet object is a superset of the specified collection or not. Syntax:
mySet1.IsSupersetOf(mySet2);
Here, mySet1 and mySet2 are the two HashSets.
Return Value: This method returns True if the HashSet object is a superset of another subset otherwise it returns False.
Exception: This method will give ArgumentNullException if the HashSet is null.
Below given are some examples to understand the implementation in a better way:
Example 1:
CSHARP
// C# code to Check if a HashSet is a // superset of the specified collection using System; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Creating a HashSet of strings HashSet< string > mySet1 = new HashSet< string >(); // Inserting elements in HashSet mySet1.Add("Geeks"); mySet1.Add("GeeksQuiz"); // Creating a HashSet of strings HashSet< string > mySet2 = new HashSet< string >(); // Inserting elements in HashSet mySet2.Add("DS"); mySet2.Add("C++"); mySet2.Add("Java"); mySet2.Add("JavaScript"); mySet2.Add("GeeksQuiz"); mySet2.Add("Geeks"); // Check if a HashSet is a superset // of the specified collection // It should return true as HashSet mySet2 // is superset of HashSet mySet1 Console.WriteLine(mySet2.IsSupersetOf(mySet1)); } } |
Example 2:
CSHARP
// C# code to Check if a HashSet is a // superset of the specified collection using System; using System.Collections.Generic; class GFG { // Driver code public static void Main() { // Creating a HashSet of integers HashSet< int > mySet1 = new HashSet< int >(); // Inserting elements in HashSet mySet1.Add(2); mySet1.Add(3); mySet1.Add(4); mySet1.Add(5); // Creating a HashSet of integers HashSet< int > mySet2 = new HashSet< int >(); // Inserting elements in HashSet mySet2.Add(3); mySet2.Add(4); mySet2.Add(5); mySet2.Add(6); // Check if a HashSet is a superset // of the specified collection // It should return false as HashSet mySet2 // is not a superset of HashSet mySet1 Console.WriteLine(mySet2.IsSupersetOf(mySet1)); } } |
Reference:
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