Learning Functional Programming in Scala Alvin Alexander A logical, step by step approach to learning functional programming Copyright Learning Functional Programming in Scala Copyright 2017 Alvin J. Alexander All rights reserved. No part of this book may be reproduced without prior written permission from the author. Disclaimer: This book is presented solely for educational purposes, and it’s also a work in progress. While best efforts have been used in preparing this book, the author makes no representations or warranties of any kind and assume no liabilities of any kind with respect to the accuracy or completeness of the contents, and specifically disclaim any implied warranties of merchantability or fitness of use for a particular purpose. The author shall not be held liable or responsible to any person or entity with respect to any loss or incidental or consequential damages caused, or alleged to have been caused, directly or indirectly, by the information or programs contained herein. Any use of this information is at your own risk. The advice and strategies contained herein may not be suitable for your situation. Version 0.1.1, published May 15, 2017 (The cover photo was taken on the Dalton Highway in Alaska, somewhere between Fairbanks and Prudhoe Bay.) Contents 1 Changelog 1 2 Preface 3 3 Introduction (or, Why I Wrote This Book) 5 4 Who This Book is For 11 5 Goals 15 6 Question Everything 23 7 Rules for Programming in this Book 33 8 One Rule for Reading this Book 39 9 What is “Functional Programming”? 41 10 What is This Lambda You Speak Of ? 55 i ii CONTENTS 11 The Benefits of Functional Programming 73 12 Disadvantages of Functional Programming 99 13 The “Great FP Terminology Barrier” 123 14 Pure Functions 131 15 Grandma’s Cookies (and Pure Functions) 141 16 Benefits of Pure Functions 153 17 Pure Functions and I/O 163 18 Pure Function Signatures Tell All 173 19 Functional Programming as Algebra 181 20 A Not

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