Glossary term
What is feature flag? Meaning for developers
A switch that turns a feature on or off, or gives it to a share of users, without a new deploy.
Learn it properly · Practical Design ProblemsLesson 7: Design an LRU Cache, Idempotent Payments and Other Classic Mini-ProblemsShort worked designs: an LRU cache, idempotency keys, a job queue with retries and backoff, and feature flags.