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JavaScript Domain-Driven Design
JavaScript Domain-Driven Design

JavaScript Domain-Driven Design: Speed up your application development by leveraging the patterns of domain-driven design

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JavaScript Domain-Driven Design

Chapter 2. Finding the Core Problem

Every piece of software is written to solve a problem, and in turn is a perfectly valid solution for this exact problem. Sadly, the problem a piece of software solves so perfectly is not always the problem the software was created for in the first place or even the problem the programmer had in mind when the software was written. The history of programming is full of examples where developers tried various ways to come up with a way to be able to perfectly state a problem first, and then implement a solution. Developing software based on the waterfall model is a great example of having a nice idea that failed to deliver on the promise. When you ask the parties involved about the failure, the reason will most likely be that the problem diverged from the specification, or the specification was misunderstood in—according to one party—a very obvious way. So, why is this?

When starting a software project, especially one motivated by...

Exploring a problem

There are not many problems in software development that can be fully specified easily. Even the few that seem like it leave some room for interpretation. When working on a project to implement a database adapter, I recently faced exactly this. There was a specification that needed to be implemented, and a set of unit tests making sure the implementation conforms to the specification. However, as I implemented it, I found myself asking questions along the way. The main question was very similar to what I would have asked if I hadn't had the specification: How are people going to use this piece of code? In a lot of cases, there are multiple ways to implement a certain feature, but picking one often means weighing different tradeoffs against each other, such as speed, extensibility, and readability.

In our orc dungeon, we have to ask the same basic question: How is the client going to use our software? Sadly, this question by itself will not yield the results we have...

Involving the experts

As we explore the domain from every angle, it is important to talk to the people who know as much as one can about it. One of the core ideas of domain-driven design is to create a language around the domain that can be spoken by each party involved. When talking about the tools, we set out to create them in such a way developers as well as domain experts can take part on an equal footing, so each can draw from the other's knowledge to approach a problem.

The spoken language is a problem in itself, so for developers it needs to be as unambiguous as possible, because very concrete and specific ideas need to be expressed. There should be no room for misinterpretation. For business people, on the other hand, it needs to be understandable for such a non-technical audience. Now comes the important part, where we actually are going to see whether we have achieved this goal so far, and how we are able to communicate the ideas of the domain back and forth.

When involving...

Identifying the hard problem

Over the last sections, we started to gain a solid understanding of the interactions in the system. Now it is time to leverage this understanding and move on to implementing our software solution. So, what should we start with when developing the software?

Often when a project is started, we like to start with the easy part, maybe create a project from a template—for example, running a framework code generator, such as Node.js Express, in a new folder to set us up with the scaffold structure for our project. At first, this seems like a really good option as it creates a lot of the boilerplate code we would have to write to create an Express project otherwise. But, does it move use closer to solving a business problem? We now have a code base to explore but, as it is auto-generated, we don't have any domain-specific code obviously. On the other hand, we have locked ourselves in a fixed structure. For some projects, this is a good thing; it means that...

Getting started, it's about time

With the previous work done, we are now at a point where we can start to work on the first feature of the application. We explored our ideas as far as we needed, and are in a position where we can actually talk about the details with our domain experts. I simplified the steps to get here a bit in the sense that we only talked about one iteration. In reality, this process most likely takes several iterations where your own understanding of the problem evolves. Sometimes not only your understanding changes, but often the business side also refines its own understanding along the way as well.

Creating value without creating code

As programmers, we often feel that the value we create is tied to the code we create, but this is not true, I will even go as far as to say that our value lies in the code we don't create. The simpler we can make a problem, the easier it is to move the project forward, and simplicity is based on a solid understanding of working...

Summary

In this chapter, we learned how we can get started with a project prior to writing code. We focused on the interaction with the business experts, providing them with feedback by illustrating our thinking. We covered the importance of gathering knowledge and how to organize that knowledge so we can leverage it later on in the project to understand the goals of the application we are building.

As we moved forward, we looked into how to identify the core feature set and choose a good starting point to not only provide value to the business early on, but also to help us further understand the business domain. This process is similar to the goals of agile methodologies, trying to cover the core problems early on and provide quick value and feedback to the business.

In the next chapter, we are going to get started setting up the project and covering the important details to get a good grip on managing the process throughout development.

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Description

If you are an experienced JavaScript developer who wants to improve the design of his or her applications, or find yourself in a situation to implement an application in an unfamiliar domain, this book is for you. Prior knowledge of JavaScript is required and prior experience with Node.js will also be helpful.

Who is this book for?

If you are an experienced JavaScript developer who wants to improve the design of his or her applications, or find yourself in a situation to implement an application in an unfamiliar domain, this book is for you. Prior knowledge of JavaScript is required and prior experience with Node.js will also be helpful.

What you will learn

  • Make communication with businesses more productive by identifying your requirements
  • Analyze a project to build the right features at the right time
  • Test the vital parts of your project by implementing testdriven design
  • Create application prototypes and utilize UML to enhance developer productivity
  • Explore effective means of communicating with nondevelopers to find out more about their requirements
  • Discover how to create manageable applications in JavaScript from scratch
  • Learn to quickly build advanced JavaScript applications
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jul 31, 2015
Length: 206 pages
Edition : 1st
Language : English
ISBN-13 : 9781784394325
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Product Details

Publication date : Jul 31, 2015
Length: 206 pages
Edition : 1st
Language : English
ISBN-13 : 9781784394325
Languages :

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Table of Contents

9 Chapters
1. A Typical JavaScript Project Chevron down icon Chevron up icon
2. Finding the Core Problem Chevron down icon Chevron up icon
3. Setting Up a Project for Domain-driven Design Chevron down icon Chevron up icon
4. Modeling the Actors Chevron down icon Chevron up icon
5. Classification and Implementation Chevron down icon Chevron up icon
6. Context Map – The Big Picture Chevron down icon Chevron up icon
7. It's Not All Domain-driven Design Chevron down icon Chevron up icon
8. Seeing It All Come Together Chevron down icon Chevron up icon
Index Chevron down icon Chevron up icon

Customer reviews

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SuJo Sep 14, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
JavaScript Domain-Driven DesignIt was refreshing to read a new updated title on JavaScript, and this book didn't disappoint. I ABSOLUTELY love the theme of the book, using Orcs was a highlight and spoke to my geeky heart. Sadly, you won't be building a robust prison game; however after you're finished reading this book you may just finish off the prison with your own style and flare. I really appreciated the inclusion of API's and how to manage one, far too often I see library's that grown in size yet the documentation lacks, so starting with good principles is perfectly acceptable to me. Favorite portions include, 'Not so scary UML', and 'Paper programming'. They are both equally important in approaching non-coders to discuss what the application at hand should do and how it should perform actions. By the end of the book you'll have come to the conclusion of an excellent journey, one that will have taught you a lot about Domain-Driven Design in a non boring manner.
Amazon Verified review Amazon
John Fitzgerald Jul 15, 2017
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
Title of the book could be: "Some DDD, and mostly generic advice on good software development for beginning Javascript developers"What I liked about this book only are:- Talking about Orcs and Dungeon Management in DDD instead of boring business related concept- Scattered knowledge of the author for some good "general" advice on software developmentWhat I didn't like are:- Not enough examples- Existing examples cannot teach you anything about DDD- Never ending talks about everything, mostly not related to DDD and can't show what it promises in the title- Shallow examination of DDD conceptsYou may read Evan's Domain Driven Design (DDD) book instead of this one. This one is shallow, messy and will teach you wrong things about DDD.
Amazon Verified review Amazon
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