Phase 20 · Advanced Topics

Topics

Feature Flags

Part of the Frontend Developer Roadmap.

Summary

Toggles that let you enable or disable features at runtime without deploying new code — used for gradual rollouts, A/B testing, and safely shipping incomplete work.

How to Learn This

  • 1Add a simple boolean feature flag (even hardcoded) gating one feature in a project.
  • 2Read how a feature-flag service (LaunchDarkly, GrowthBook) manages flags remotely.
  • 3Learn why flags let teams ship code to production before a feature is fully 'launched'.
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