Hash Tables & JavaScript Objects

What hash table application is demonstrated here?

function memoize(fn) {
  const cache = new Map();
  return function(...args) {
    const key = JSON.stringify(args);
    if (cache.has(key)) return cache.get(key);
    const result = fn.apply(this, args);
    cache.set(key, result);
    return result;
  };
}

Data validation
Function composition
Result caching
This implements function memoization using Map: 1) Caches function results by arguments, 2) Uses JSON.stringify for composite key generation, 3) Avoids recomputation of expensive operations, 4) Implements time-space trade-off, 5) Maintains function context with apply, 6) Common optimization technique, 7) Useful for pure functions, 8) Important for performance optimization.
Error handling

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