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Getting started

From Dinosaurs to Aliens

Implement Space Mode

Configure the SDK

Create a feature flag

Hide behind a flag

Test your changes

Listening for flag changes

Check your work

How LaunchDarkly works

Lesson 1: Deployment vs Release

Understanding targeting

Changing the key

Targeting individual users

Targeting with rules

Use Cases

Lesson 2: Targeting

Setting Up a Percentage Rollout

Implementing Our Feature Flag

Bucketing New Users

Running an Experiment

Setting Up a Metric

Adding the Score Metric

Configuring Your Experiment

Simulating Experiment Traffic

Interpreting Results

Excluding Users from an Experiment

How Percentage Rollouts Work (Optional)

Lesson 3: Percentage Rollouts and Experimentation

Flag statuses

Filtering the flag list

Code references

Cleaning up code

Archiving old flags

Maintaining flag hygiene

Lesson 4: Flag hygiene

Lesson 5: Take-home challenge

Conclusion

Feature Management 101

<h2>Getting Started</h2>
In this tutorial, you'll make some changes to a simple browser-based game called T-Rex Runner. The game is composed of HTML, Javascript, and CSS.
If you use the Google Chrome browser, you may have played T-Rex Runner before. This game appears when your network is disconnected.
<img src="/images/trex-game.png" alt="TRex Runner">
At the end of this lesson, we will transform this game to Toggle Runner, an intergalactic space runner game based on LaunchDarkly's mascot, Toggle:
<img src="/images/toggle-runner.png" alt="Toggle Runner">
The code in this tutorial is written in JavaScript and requires a browser that <a href="https://caniuse.com/mdn-javascript_statements_import">supports ES6 Modules</a>. Any modern browser except Internet Explorer should do the trick. If you're not familiar with JavaScript, it's okay. The concepts we discuss in this tutorial apply to the other programming languages supported by LaunchDarkly.
We will use <a href="https://replit.com/">Replit</a>, a web-based code environment, to edit and run code. Each lesson in this tutorial will expand the game with new features.
When you're ready to proceed, click the Next button below.