Promise Cache

Create a cache wrapper for async functions to avoid redundant calls.

Requirements:

• Implement promiseCache that wraps an async function
• Cache results by function arguments
• If same arguments used again, return cached result
• Support cache invalidation
• Handle errors properly (don't cache errors)

Example:

let callCount = 0;
const fetchUser = async (id) => {
  callCount++;
  return { id, name: `User${id}` };
};

const cachedFetch = promiseCache(fetchUser);

await cachedFetch(1); // Calls fetchUser
await cachedFetch(1); // Returns cached result
console.log(callCount); // 1