Architecture Intermediate

Feature Flags implementace¶

Feature FlagsDeploymentRelease 3 min read

Postupný rollout nových funkcí. Kill switches, percentage rollout a A/B testing.

Types¶

• Release Toggle — postupný rollout (10% → 50% → 100%)
• Experiment — A/B testing
• Ops Toggle — kill switch
• Permission — funkce pro specifické plány

Implementation¶

class FeatureFlags {
    isEnabled(flag, ctx = {}) {
        const f = this.flags[flag];
        if (!f?.enabled) return false;
        if (f.percentage !== undefined) {
            return (this.hash(ctx.userId) % 100) < f.percentage;
        }
        if (f.allowedUsers?.includes(ctx.userId)) return true;
        return f.enabled;
    }
}
// Konfigurace
const flags = new FeatureFlags({
    newCheckout: { enabled: true, percentage: 25 },
    darkMode: { enabled: true }
});

Tools¶

• LaunchDarkly — enterprise
• Unleash — open-source
• Flagsmith — open-source + cloud

Summary¶

Must-have pro continuous delivery. Udržujte disciplínu — pravidelně odstraňujte staré flags.

Need Help with Implementation?¶

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