Solution: Cache Expensive Function Calls via Proxy

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.