Summary
In this chapter, you learned how to implement a Set class from scratch, which is similar to the Set class defined in the definition of ECMAScript 2015. We also covered some methods that are not usually present in other programming language implementations of the set data structure, such as union, intersection, difference, and subset. We implemented a complete Set class compared to the current implementation of Set in other programming languages.
In the next chapter, we will cover hashes and dictionaries, which are non-sequential data structures.