Meaning
A feature toggle (also known as a feature flag) is a software development technique that allows turning specific functionality on or off without deploying new code. It enables teams to release features gradually, perform A/B testing, and roll back problematic features quickly. Toggles are typically managed via configuration files, databases, or dedicated feature flag services.
Primary Function
Release management
Communicative Purpose
Allows enabling or disabling features at runtime to control exposure and reduce risk.
Pattern
wrap feature code in a toggle check to enable/disable at runtime
Função primária
Release management
Propósito comunicativo
Allows enabling or disabling features at runtime to control exposure and reduce risk.
Situações de gatilho
Deploying uncertain features, running experiments, performing canary releases, hot‑fixing problematic code.
Contextos
Web services, mobile apps, backend systems, DevOps pipelines, product experimentation platforms.
Padrão
wrap feature code in a toggle check to enable/disable at runtime
Colocados típicos
- configuration service
- A/B testing framework
- gradual rollout system
Substituições comuns
- feature flag
- release toggle
- dark launch
Erros comuns
leaving toggles stale indefinitely, using toggles to gate complex business logic instead of proper abstractions, over‑reliance on toggles leading to technical debt
Similar / contraste
branch by abstraction (long‑lived feature branches) – keeps code in separate branches until ready; feature branching – merges code behind toggle but still requires branch management
Interferências
Coming from static configuration backgrounds: may assume toggles require a redeploy to change state.
Família do chunk
- Feature flag
- canary release
- dark launch
Nuance
Toggles add maintenance overhead; they should be removed once a feature is stable and fully rolled out.
Efeito pragmático
Enables safe experimentation, reduces release risk, and supports rapid rollback of faulty features.
Dica de memória
Think of a light switch for code features.
Nota
Feature toggles should be short‑lived; plan for cleanup to avoid accumulating dead flags.
Upgrade path
Implement a dynamic feature flag service with rollout percentages and targeting rules.
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