memoize.ts

export function memoize<R, T extends (...args: any[]) => R>(f: T): T {
  const cache = new Map<string, R>();
  return ((...args: any[]) => {
    const key = JSON.stringify(args);
    if (!cache.has(key)) cache.set(key, f(...args));
    return cache.get(key);
  }) as T;
}