Functional Programming in Java

Chapter 9Bringing It All Together

Any intelligent fool can make things bigger, more complex, and more violent. It takes a touch of genius—and a lot of courage—to move in the opposite direction.

Albert Einstein

We explored Java 8 lambda expressions throughout this book, using them to iterate over collections, to achieve better lightweight design, and to easily compose and parallelize code. In this final chapter we’ll bring it all together. We’ll review the practices we have to hone to fully benefit from functional style, then discuss the performance impact of this style and conclude with some recommendations on how we can successfully adopt the functional style.