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Solution: Standardize File Storage Clients

Explore how to implement the Adapter Pattern in Node.js to standardize interfaces across different file storage clients. Understand how to create a StorageAdapter class that wraps incompatible clients, unifying their upload and download methods. This lesson helps you write cleaner, more maintainable backend code by removing client-specific conditionals and enabling consistent interaction with local and cloud storage systems.

Solution explanation

  • Lines 2–19: We define two incompatible clients:

    • localFs uses save() and read() for file operations.

    • s3Client uses uploadFile() and getFile().

  • Lines 22–24: The StorageAdapter constructor accepts any client instance.

    • It stores a reference to the wrapped client.

    • This enables the adapter to forward calls dynamically.

  • Lines 26–31: The .upload() method unifies upload behavior.

    • If ...