Create cached function (memoize)

cached.js

export const cached = (fn) => {
  const cache = new Map();

  return function cachedFn(...args) {
    const input = JSON.stringify(args);

    if (cache.has(input)) {
      return cache.get(input);
    }

    const result = fn.apply(this, args);
    cache.set(input, result);

    return result;
  };
};