Book Image

Domain-Driven Design with Golang

By : Matthew Boyle
4 (2)
Book Image

Domain-Driven Design with Golang

4 (2)
By: Matthew Boyle

Overview of this book

Domain-driven design (DDD) is one of the most sought-after skills in the industry. This book provides you with step-by-step explanations of essential concepts and practical examples that will see you introducing DDD in your Go projects in no time. Domain-Driven Design with Golang starts by helping you gain a basic understanding of DDD, and then covers all the important patterns, such as bounded context, ubiquitous language, and aggregates. The latter half of the book deals with the real-world implementation of DDD patterns and teaches you how to build two systems while applying DDD principles, which will be a valuable addition to your portfolio. Finally, you’ll find out how to build a microservice, along with learning how DDD-based microservices can be part of a greater distributed system. Although the focus of this book is Golang, by the end of this book you’ll be able to confidently use DDD patterns outside of Go and apply them to other languages and even distributed systems.
Table of Contents (13 chapters)
Part 1: Introduction to Domain-Driven Design
Part 2: Real -World Domain-Driven Design with Golang

Working with value objects

Value objects are, in some ways, the opposite of entities. With value objects, we want to assert that two objects are the same given their values. Value objects do not have identities and are often used in conjunction with entities and aggregates to enable us to build a rich model of our domain. We typically use them to measure, quantify, or describe something about our domain.

Before we go any further, let’s write some Golang code to help us understand value objects a bit further.

Firstly, we will define a Point in the following code block:

package chapter3
type Point struct {
   x int
   y int
func NewPoint(x, y int) *Point {
   return &Point{
      x: x,
      y: y,

We will also write the following test, which checks if two points with the same coordinates are equal:

package chapter3_test
import (