Functional Programming in Java

About this Book

This isn’t a book about Java. This book is about functional programming, which is a different way to write software programs. “Different” means different from the “traditional” way of writing software, which is called the imperative paradigm. This book is about applying the functional paradigm to Java programming.

There’s no such thing as a “functional language.” There are only languages that are more-or-less functional-friendly. Although I use Java in this book, you can apply all the principles I teach to any other language. Only the way in which you implement these principles would be different. You can write functional programs in any language, even those said not to be functional at all; you can similarly write imperative ...