Scala Functional Programming Patterns

Preface

This is a book on functional programming patterns using Scala. Functional programming uses functions as basic building blocks. These are functions that don't have any side effects. This challenges our notions about how to write programs. The order of execution for such functions does not matter. We get to reason about them in a referentially transparent manner. This can be a big help in proving correctness. It feels just like a plain arithmetic problem, where (2+2)*(3+3) always equals 24. You may evaluate the expression as 2+2 first, or as 3+3.

I got to know about the Unix culture early in my career. The Unix philosophy relies on pipelining small programs, each doing functionally one and only one thing. One can connect these processing ...