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  • Book Overview & Buying Functional Programming in Go
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Functional Programming in Go

Functional Programming in Go

By : Dylan Meeus
4.9 (12)
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Functional Programming in Go

Functional Programming in Go

4.9 (12)
By: Dylan Meeus

Overview of this book

While Go is a multi-paradigm language that gives you the option to choose whichever paradigm works best for the particular problem you aim to solve, it supports features that enable you to apply functional principles in your code. In this book, you’ll learn about concepts central to the functional programming paradigm and how and when to apply functional programming techniques in Go. Starting with the basic concepts of functional programming, this Golang book will help you develop a deeper understanding of first-class functions. In the subsequent chapters, you’ll gain a more comprehensive view of the techniques and methods used in functional languages, such as function currying, partial application, and higher-order functions. You’ll then be able to apply functional design patterns for solving common programming challenges and explore how to apply concurrency mechanisms to functional programming. By the end of this book, you’ll be ready to improve your code bases by applying functional programming techniques in Go to write cleaner, safer, and bug-free code.
Table of Contents (17 chapters)
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1
Part 1: Functional Programming Paradigm Essentials
7
Part 2: Using Functional Programming Techniques
11
Part 3: Design Patterns and Functional Programming Libraries

Why does purity improve our code?

So far, we have looked into some properties of purely functional code. We’ve also seen some examples of both pure and impure functions. Now, let’s look at what benefits we can expect from writing pure functional code.

Increases the testability of our code

When writing pure functions, your functions will be easier to test. This is a consequence of them being both idempotent and stateless:

  • Idempotent: Run functions any number of times and get the same result
  • Stateless: Each function will run independently of the state of the system

For idempotence, it’s easy to see how this would be true. In our test suite, if functions were to return different outputs for the same inputs, it would be hard to write tests for that function. After all, if you can’t predict the output of a certain function, you can only guess what value you should be testing for. The benefit of it being stateless might not be immediately...

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Functional Programming in Go
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