Performing operations

Set operations are performed on the calling collection object and the passed-in collection object. More specifically, set operations are used to modify the calling HashSet elements based on which operation is used. We'll get into this in more detail in the following code, but first, let's go over the three main set operations that crop up in programming scenarios the most often:

In the following definitions, currentSet refers to the HashSet calling an operation method and specifiedSet refers to the passed-in HashSet method parameter. The modified HashSet is always the current set:

currentSet.Operation(specifiedSet);

There are three main operations that we'll be working with in the rest of this section:

• UnionWith adds the elements of the current and specified sets together.
• IntersectWith stores only the elements that are in both the current and specified sets.
• ExceptWith subtracts the elements of the specified set from the current set...