Understand HashSet via Copilot

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A HashSet in C# is a powerful data structure that represents a set of values. Let me break it down for you:

Definition:
A HashSet is part of the System.Collections.Generic namespace in C#.
It’s an unordered collection that contains unique elements.
Unlike other collection types, a HashSet uses a hash table for storage, allowing for fast retrieval of elements.
It does not maintain insertion order and cannot access elements by index.
Key Features:
Uniqueness: A HashSet ensures that each element appears only once.
Performance: Adding and removing elements has constant time complexity.
Set Operations: It implements mathematical set operations (e.g., union, intersection, etc.).
Usage Example:
C#

// Create two HashSet objects
HashSet evenNumbers = new HashSet();
HashSet oddNumbers = new HashSet();

// Populate evenNumbers with even numbers
for (int i = 0; i < 5; i++)
{
evenNumbers.Add(i * 2);
}

// Call UnionWith to merge oddNumbers into evenNumbers
evenNumbers.UnionWith(oddNumbers);
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You can find more information about the HashSet class in the official Microsoft Learn documentation or explore additional resources like this comprehensive guide or this tutorial. Happy coding! 🚀