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## C# HashSet Advantages

A Set data structure was finally added to C# in the .NET Framework 3.5. It’s a powerful data structure that makes programmers’ lives a little easier…

The C# set is called a HashSet. It is modeled after a mathematical set, which means that the elements must be unique. In other words, a Set guarantees that there are no duplicate elements.

Now why create a Set data structure in C# when you could just check a list before adding an item to see if it already exists? The answer: it’s because searching for a banal list is slow. A HashSet is basically designed to allow fast lookups, which makes insertions faster.

There are different implementations of Sets. Some speed up insert and search operations by hashing items. However this means that the order in which the elements were added is lost. Other implementations preserve order added at the cost of slower execution times.

The HashSet class in C# takes the second approach, thus preserving the order of elements. It’s still much faster than an ordinary list. Some basic benchmarks have shown HashSet to be decently faster when dealing with primary types (int, double, bool, etc.). It’s much faster when working class objects. So this point is that HashSet is fast.

The only catch with HashSet is that there is no index access. To access the elements you can either use an enumerator or use the built-in function to convert the HashSet to a list and iterate through that.

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