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Solution: Factory for Dynamically Composed Middleware Chains

Dynamically compose and return a chain of middleware classes that invoke .handle(req, next) in order.

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Solution explanation

Lines 1–26: We define three middleware classes: LoggerMiddleware, AuthMiddleware, and RateLimitMiddleware.
- Each exposes an async .handle(req, next) method, modifying the request and then invoking next() to continue the chain.
- This shared interface ensures all middleware can be composed dynamically.
Lines 28–32: The middlewareMap object links config keys ('logger', 'auth', 'rateLimit') to their respective classes.
- This allows the factory to instantiate the correct middleware based on the config array without branching. ...

Solution: Factory for Dynamically Composed Middleware Chains