es6 memory function

memes

// created by @wizardnet972

function memes(fn) {
  const fns = new Map();
  return (...args) => {
    const key = `f-${args.length}`;

    if (!fns.has(key)) {
      const value = fn(...args);
      fns.set(key, value);
    }

    return fns.get(key);
  };
}

const x = memes(() => {
  console.log("in fn");
  return Math.random();
});

console.log({ x1: x() });
console.log({ x2: x() });