Feature Flags Technique

Complete Guide to Feature Toggles in Software Development

Feature Flags (also called Feature Toggles or Feature Switches) are a powerful technique that allows developers to enable or disable functionality without deploying new code. This enables safer deployments, gradual rollouts, A/B testing, and quick rollbacks. This comprehensive guide covers feature flag types, implementation strategies, best practices, and tools for managing feature flags in production environments.

isEnabled(flagName: string): boolean {

return this.flags.get(flagName) || false;

setFlag(flagName: string, enabled: boolean): void {

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// Use cached flags on error

async isEnabled(flagName: string): Promise<boolean> {

await this.refreshFlags();

Frequently asked questions

What are feature flags and how do they benefit software development?

Angular: @unleash/proxy-client-angular

What is the unleash-client-node library used for in Node.js projects?

Node.js: unleash-client-node

How does the .NET SDK for LaunchDarkly enable feature flag management in .NET applications?

.NET: LaunchDarkly .NET SDK

What is the ldclient (LaunchDarkly) library used for in Python applications?

Python: ldclient (LaunchDarkly)

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