memoize.js

function memoize(fn) {
  const cache = new Map();

  return function(...args) {
  const key = JSON.stringify(args);
    if(cache.has(key)){
      console.log('memoized return ')
      return cache.get(key)
    }
    const result = fn(...args);

    cache.set(key, result);
    return result;
  }
  
}

// Example usage:
function add(a, b) {
  console.log("Calculating sum...");
  return a + b;
}

const memoizeAddFn = memoize(add);

console.log(memoizeAddFn(1, 2)); // Calculates and returns 3
console.log(memoizeAddFn(1, 2)); // Returns cached 3 without calculating
console.log(memoizeAddFn(2, 3)); // Calculates and returns 5
console.log(memoizeAddFn(2, 3)); // Returns cached 5