In the last chapter, we revisited variables, types, and classes to see what they had to offer beyond the basic features introduced at the beginning of the book. In this chapter, we'll take a closer look at new collection types and learn about their intermediate-level capabilities. 

Each of the new collection types in this chapter has a specific purpose. For most scenarios where you need a collection of data, a list or array works just fine. When you need temporary storage or control over the order of collection elements, or more specifically, the order they are accessed, look to stacks and queues. When you need to perform operations that depend on every element in a collection to be unique, meaning not duplicated, look to HashSets. Remember, being a good programmer isn't about memorizing code: it's about choosing the...