In this chapter, we have taken a deep dive into the remainder of the primitive types that TypeScript makes available, such as any, null, undefined, object, and never. We covered a diverse range of language constructs, including the
let keyword, optional chaining, nullish coalescing, object rest and spread, and tuples. We finished the chapter with a discussion on function definitions, and showed how we can use a variety of language constructs to accurately specify function parameters. In the next chapter, we will explore object-oriented programming techniques, including the use of classes, interfaces, inheritance, and modules.