Effective Haskell

Summary

In this chapter, you learned about how to do IO in a purely functional lazy language, including what IO actions are, how to combine them into larger and more complex actions, and how to understand the way that they are evaluated in running programs. In the next chapter, we’ll take these concepts and put them to use to build a full application. Before you move on, take some time to review the exercises at the end of the chapter and work through a few of them. Understanding the basics of how IO works will be important for your understanding of the rest of the content in this book.