C# | Remove elements from a SortedSet that match the predicate - Coding

SortedSet class represents the collection of objects in sorted order. This class comes under the System.Collections.Generic namespace. SortedSet<T>.RemoveWhere(Predicate<T>) Method is used to remove all elements that match the conditions defined by the specified predicate from a SortedSet<T>.

Properties:

In C#, SortedSet class can be used to store, remove or view elements.
It maintains ascending order and does not store duplicate elements.
It is suggested to use SortedSet class if you have to store unique elements and maintain ascending order.

Syntax:

public int RemoveWhere (Predicate<T> match);

Return Value: This method returns the number of elements that were removed from the SortedSet<T> collection.

Exception: This method will give ArgumentNullException if the match is null.

Note: Calling this method is an O(n) operation, where n is Count i.e, the number of elements that are contained in the SortedSet.

Below are the examples to illustrate the SortedSet<T>.RemoveWhere(Predicate<T>) Method

Example 1:

// C# code to remove elements from a SortedSet 
// that match the predicate 
using System; 
using System.Collections.Generic; 
  
class GFG { 
  
    // Driver code 
    public static void Main() 
    { 
  
        // Creating a SortedSet of integers 
        SortedSet<int> mySet = new SortedSet<int>(); 
  
        // Inserting elements into SortedSet 
        for (int i = 0; i < 10; i++) { 
            mySet.Add(i); 
        } 
  
        Console.WriteLine("The elements in SortedSet are : "); 
  
        // Displaying the elements in SortedSet 
        foreach(int i in mySet) 
        { 
            Console.WriteLine(i); 
        } 
  
        // Displaying the number of elements in SortedSet 
        Console.WriteLine("Number of elements are : " + mySet.Count); 
  
        // Remove elements from a SortedSet 
        // with conditions defined by the predicate 
        mySet.RemoveWhere(isEven); 
  
        Console.WriteLine("The elements in SortedSet are : "); 
  
        // Displaying the elements in SortedSet 
        foreach(int i in mySet) 
        { 
            Console.WriteLine(i); 
        } 
  
        // Displaying the number of elements in SortedSet 
        Console.WriteLine("Number of elements are : " + mySet.Count); 
    } 
  
    // Helper function which tells 
    // whether an element is even or not 
    private static bool isEven(int i) 
    { 
        return ((i % 2) == 0); 
    } 
} 

Output:

The elements in SortedSet are : 
0
1
2
3
4
5
6
7
8
9
Number of elements are : 10
The elements in SortedSet are : 
1
3
5
7
9
Number of elements are : 5

Example 2 :

// C# code to remove elements from a 
// SortedSet that match the predicate 
using System; 
using System.Collections.Generic; 
  
class GFG { 
  
    // Driver code 
    public static void Main() 
    { 
  
        // Creating a SortedSet of integers 
        SortedSet<int> mySet = new SortedSet<int>(); 
  
        // Inserting elements into SortedSet 
        for (int i = 0; i < 20; i++) { 
            mySet.Add(i); 
        } 
  
        // Displaying the number of elements in SortedSet 
        Console.WriteLine("Number of elements are : " + mySet.Count); 
  
        // Remove elements from a SortedSet 
        // with conditions defined by the predicate 
        mySet.RemoveWhere(myFunc); 
  
        // Displaying the number of elements in SortedSet 
        Console.WriteLine("Number of elements are : " + mySet.Count); 
    } 
  
    // Helper function which tells 
    // whether an element is divisible 
    // by both 2 and 3 
    private static bool myFunc(int i) 
    { 
        return ((i % 2) == 0 && (i % 3 == 0)); 
    } 
} 

Output:

Number of elements are : 20
Number of elements are : 16

Reference:

https://docs.microsoft.com/en-us/dotnet/api/system.collections.generic.sortedset-1.removewhere?view=netframework-4.7.2

Reffered: https://www.geeksforgeeks.org

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