Book Image

Feature Management with LaunchDarkly

By : Michael Gillett
Book Image

Feature Management with LaunchDarkly

By: Michael Gillett

Overview of this book

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.
Table of Contents (18 chapters)
1
Section 1: The Basics
5
Section 2:Getting the Most out of Feature Management
11
Section 3: Mastering LaunchDarkly

Technical requirements

This chapter contains code samples showing how to set up and configure the User object. The examples won't show a fully working application; instead, they will show how to work with the User object. If you want to implement these samples, you can try them out using the example application from Chapter 3, Basics of LaunchDarkly and Feature Management.

The code samples will be written in C# and will make use of the .NET LaunchDarkly SDK. This is the same setup that was used in the examples from Chapter 3, Basics of LaunchDarkly and Feature Management. The code samples will differ for different platforms and SDKs, so you will need to refer to the LaunchDarkly user configuration docs (https://docs.launchdarkly.com/sdk/features/user-config) to implement it within your application.