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Key benefits

Learn how to work with LaunchDarkly to turn features on and off within your production applications

Explore the ways in which feature management can change how software is built and how teams work

Master every aspect of LaunchDarkly’s functionality to test in production and learn from your users

Description

Over the past few years, DevOps has become the de facto approach for designing, building, and delivering software. Feature management is now extending the DevOps methodology to allow applications to change on demand and run experiments to validate the success of new features. If you want to make feature management happen, LaunchDarkly is the tool for you. This book explains how feature management is key to building modern software systems. Starting with the basics of LaunchDarkly and configuring simple feature flags to turn features on and off, you'll learn how simple functionality can be applied in more powerful ways with percentage-based rollouts, experimentation, and switches. You'll see how feature management can change the way teams work and how large projects, including migrations, are planned. Finally, you'll discover various uses of every part of the tool to gain mastery of LaunchDarkly. This includes tips and tricks for experimentation, identifying groups and segments of users, and investigating and debugging issues with specific users and feature flag evaluations. By the end of the book, you'll have gained a comprehensive understanding of LaunchDarkly, along with knowledge of the adoption of trunk-based development workflows and methods, multi-variant testing, and managing infrastructure changes and migrations.

Who is this book for?

This book is for developers, quality assurance engineers and DevOps engineers. This includes individuals who want to decouple the deployment of code from the release of a feature, run experiments in production, or understand how to change processes to build and deploy software. Software engineers will also benefit from learning how feature management can be used to improve products and processes. A basic understanding of software is all that you need to get started with this book as it covers the basics before moving on to more advanced topics.

What you will learn

Get to grips with the basics of LaunchDarkly and feature flags

Roll out a feature to a percentage or group of users

Find out how to experiment with multi-variant and A/B testing

Discover how to adopt a trunk-based development workflow

Explore methods to manage infrastructure changes and migrations

Gain an in-depth understanding of all aspects of the LaunchDarkly tool

What do you get with Print?

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Redeem a companion digital copy on all Print orders

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Amazon verified reviews

AJ Oct 29, 2021

I work on the revenue side of a company in the software development tooling space and I decided to read this book to gain a deeper understanding of modern software development and release practices. Feature Management seems to be becoming the table stakes for accelerating release cycles and moving toward trunk-based development. I will admit, some parts of this book were a little over my head since I'm not a developer, but after spending my career in technology, most of it was extremely helpful for me to learn more about the ecosystem my company exists in. The writing was very clear and informative as well which was very helpful.

Amazon Verified review

Andrico Karoulla Jan 01, 2022

Feature Management with LaunchDarkly teaches you to use Feature Toggling services to help deploy safely, delivery quickly, and measure success.I've had a little experience with LaunchDarkly (LD) in the past, and the second and third parts of the book took me from an LD novice to someone confident with its wide array of features. By having a greater understanding of the tools I use, I improved my feature development experience and provided more valueto my end users!This book isn't simply an instruction manual for LD though, Michael puts into plain words how the delivery process has shifted from one-time big bang releases, to iterative releases. You'll be introduced to some of the core methodologies behind modern DevOps practices. So for those folks frustrated with deploying to 5 environments before hitting prod, or in endless stakeholder meetings bickering about button copy, this book is for you!

Tiny Oct 29, 2021

Before reading this, I hadn’t been particularly inclined towards LaunchDarkly but I did want to know about Feature Management and flagging. This book answered all my questions and more, including the freemium access to LaunchDarkly to try out some of the more advanced questions against the home setup. The text was excellent with lots of screenshots and representations. Most of the code is .Net or C# and the text notes the free trial available from LaunchDarkly as well. The author varies from explaining the conceptual background to following up in the next chapter with the implementation needed to make the process work. The book neatly splits into three sections, the basics, getting the most from your feature management, and advanced elements tied specifically to the LaunchDarkly platform. At the basic level, Feature management is using an if/then statement to flag your code in a manner where you can easily stop or start different functions depending on requirements. LaunchDarkly offers an easier way to track, manage and change those requirements in production. Any attribute you can track or measure against an if/then can be used in feature flagging. One can use a user name, individual key, country of origin, IP address or any other measure to return true or false against various services.People will tell you that testing in production is never a good answer but the ring and percentage rollouts offered by LaunchDarkly allow you to do just that without having to purchase additional hardware or licenses. The tools even allow you to develop permanent flags as switches within the code. These advanced concepts allow one to set-up time based experiments to run test-driven features and provide critical metrics about core systems. The book comes with connections to a GitHub repo to try out some of the options and find your own ways around the code. My biggest regret is that I was not a LaunchDarkly user before reading this text, while I have reason to change, we already have workarounds in our Continuous Integration pipelines using the aforementioned if/then statements rather than dedicated feature flagging. However, it does let me know that if I change to a new project, there may be a better way to implement feature management from the start. However, the connection and plugins with services like DataDog and Splunk may lead me back to LaunchDarkly sooner rather than later. Overall, I greatly enjoyed the book. It is well-written, easy to read, and includes useful graphics, frequently with both the command line and the LaunchDarkly GUI referenced. I would recommend it for developers, testers, and engineers looking for a better way to do business.

Rooney Thomas Oct 31, 2021

As someone who recently joined LaunchDarkly, I accepted the offer to review a book that delved into the Feature Management category and how LaunchDarkly address’ the space. The author talks to those with a baseline understanding of how software is developed to convey how LaunchDarkly ensures the fundamentals needed to separate code development from release. From there, time is spent to clearly describe more advanced concepts in the development cycle. The author moves forward to show how LauchDarkly address’ the fundamentals of Feature Management while allowing teams to innovate to their desired speed and scale by combining modern software development with the stability, ease and creativity that LaunchDarkly offers around release, experimentation and even test in prodcution. My takeaway, great innovation is built on a foundation of sound principles. Feature Management is a must as we move to a perpetual motion of fulfilling new and evolving demand. This book provides a wonderful understanding of the ‘why’s’, ‘how’s’ and potential of Feature Management.

m Dec 08, 2021

If you are looking to adopt modern development practices such as DevOps, CI/CD, Cloud, be Agile or just Feature Flags, this is the book for you. I am fairly new to Feature Management and thought I understood how this can help improve products, processes, and our digital transformation efforts. I did not know half of it. This book does a fantastic job of outlining the steps necessary to successfully move to feature management, how easy it is to use LaunchDarkly and how easy it is to see benefits early on. It comes from the perspective of people who do this every day and understand the challenges that come with modern development practices. There are so many unknown benefits of using Feature Management/LaunchDarkly within your organization and this even subtly highlights challenges I didn't realize I could solve with Feature Flags. Worth reading!

Feature Management with LaunchDarkly: Discover safe ways to make live changes in your systems and master testing in production

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