Functional Programming in Scala

Preface

Writing good software is hard. After years of struggling with other approaches, both of us discovered and fell in love with functional programming (FP). Though the FP approach is different, we came to appreciate how the discipline leads to a coherent, composable, and beautiful way of writing programs.

Both of us participated in the Boston Area Scala Enthusiasts, a group that met regularly in Cambridge. When the group first started, it mainly consisted of Java programmers who were looking for something better. Many expressed frustration that there wasn’t a clear way to learn how to take advantage of FP in Scala. We could empathize—we had both learned FP somewhat haphazardly, by writing lots of functional code, talking to and learning ...