JavaScript Memoize Function

memoize.js

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

  return (...args) => {
    const key = JSON.stringify(args);

    if (cache.has(key)) return cache.get(key);
    
    const result = fn(...args);
    cache.set(key, result);
    return result;
  }
}

Basic, general-purpose, memoize function.