Grokking Node.js Design Patterns for Interviews/

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Create a Feature-Flagged Analytics Service

Create a Feature-Flagged Analytics Service

Return either a real analytics service or a stub based on a feature flag, using only factory logic.

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Problem statement

You’re rolling out a new analytics module, but it’s not yet available to all users. It’s gated behind a flags.analyticsEnabled feature flag. The team needs a factory that returns either:

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