Solution: Cache Expensive Function Calls via Proxy

Explore how to implement caching for costly function calls in Node.js using the Proxy pattern. Learn to intercept function calls with the apply trap, store results based on input arguments, and return cached outputs to improve performance without modifying the original function.

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Solution explanation
Revisit the problem statement

Solution explanation

Lines 2–5: We define heavyComputation() to simulate a costly calculation.
- It logs "Computing..." each time it runs, signaling real work.
- The random component ensures that identical inputs normally produce different results, making caching effects visible.
Lines 8–25: The createCachedFunction() builds a Proxy that intercepts calls to the given function.
- A cache map stores previous results keyed by the serialized arguments.
- This ensures unique combinations of inputs map to specific cached outputs.
Lines 12–21: The apply() trap handles any direct or indirect function invocation.

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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: Cache Expensive Function Calls via Proxy

Solution explanation