Solution: Compress Files with Switchable Encoders

Explore how to apply the Strategy Pattern in Node.js by creating a file compression utility that dynamically switches between Gzip, Brotli, and no compression strategies at runtime. Understand asynchronous compress methods and composition to avoid conditional logic.

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Solution explanation
Revisit the problem statement

Solution explanation

Lines 2–22: We define three encoder strategies: GzipEncoder, BrotliEncoder, and NoCompression.
- Each implements an asynchronous .compress() method that returns a Promise.
- GzipEncoder simulates fast compression with a short delay.
- BrotliEncoder takes longer, reflecting higher compression cost.
- NoCompression resolves immediately, returning the data unchanged.
- This demonstrates asynchronous strategies that share the same interface.
Lines 25–38: The Compressor class is the context.
- It stores a reference to the current encoder strategy. ...

1.Introduction to Node.js Patterns

2.Factory Pattern: Generate Config-Driven Services Dynamically

3.Builder Pattern: Assemble Complex Objects with Fluent APIs

4.Decorator Pattern: Extend Behavior Without Modifying Core Logic

5.Adapter Pattern: Standardize Interface Across Dependencies

6.Proxy Pattern: Intercept and Control Access Transparently

7.Strategy Pattern: Swap Algorithms Based on Context

8.Wrapping Up

Solution: Compress Files with Switchable Encoders

Solution explanation