Book Image

Mastering Functional Programming

Book Image

Mastering Functional Programming

Overview of this book

Functional programming is a paradigm specifically designed to deal with the complexity of software development in large projects. It helps developers to keep track of the interdependencies in the code base and changes in its state in runtime. Mastering Functional Programming provides detailed coverage of how to apply the right abstractions to reduce code complexity, so that it is easy to read and understand. Complete with explanations of essential concepts, practical examples, and self-assessment questions, the book begins by covering the basics such as what lambdas are and how to write declarative code with the help of functions. It then moves on to concepts such as pure functions and type classes, the problems they aim to solve, and how to use them in real-world scenarios. You’ll also explore some of the more advanced patterns in the world of functional programming such as monad transformers and Tagless Final. In the concluding chapters, you’ll be introduced to the actor model, which you can implement in modern functional languages, and delve into parallel programming. By the end of the book, you will be able to apply the concepts of functional programming and object-oriented programming (OOP)in order to build robust applications.
Table of Contents (17 chapters)

Chapter 4

  1. For this book, side effects are defined as modifications and interactions with the environment outside the scope of the current unit of logic (function).
  2. It is a data that can be changed by the program.
  3. They cause extra mental load on your mind, which may lead to bugs. There are much more things to keep in mind with side effects and mutable state. The scope of your attention must extend much further than the piece of logic that you are working on at the moment.
  4. It is a function that does not produce any side effects.
  5. The ability to substitute a call to a function with the result of that call in code without changing the semantics of that code.
  6. Decrease the mental load you face. Hence decrease the possibility of bugs.
  7. Errors, an absence of a result, delayed competition, logging, input-output operations.
  8. Yes, it is. Programming in the purely functional style is just a...