Effective Haskell

Summary

Although we call Haskell a functional programming language, data and the way that we represent it is at the heart of how to write effective Haskell programs. Creating the right data types will help the compiler help you by finding bugs and helping you write more reliable code, but more than that, the way that you structure data in your programs will influence everything about how you work with your code, and how it evolves over time. Data is, in essence, the real heart of functional programming. As you work through the rest of this book you’ll see many other ways that data impacts that way we think about code.