Memoization

Challenge summary

Cache results for repeated calls to a pure function while keeping argument identity and memory behavior explicit.

What you'll practice

• Choose a stable cache key strategy for the supported arguments.
• Return cached results without invoking the wrapped function again.
• Explain memory growth, object identity, and purity constraints.

What Premium unlocks

Premium unlocks the runnable workspace, behavioral checks, implementation walkthrough, and edge-case discussion.