Generic helper stuff for experiments

decorators.js

function memoizer(fn) {
  const cache = new Map([]);
  return (...args) => {
    let result;
    const key = args.toString();
    if (cache.has(key))
      result = cache.get(key);
    else {
      result = fn(...args);
      cache.set(key, result);
    }
    return result;
  };
}

function perfTime(fn) {
  return (...args) => {
    const begin = performance.now();
    const result = fn(...args);
    const end = performance.now();
    console.log(`Code execution took ${end - begin} milliseconds.`);
    return result;
  };
}