simple memoization js

simple_memoization.js

const memoize = (fn) => {
  let cache = {};
  const cacheFn = (...args) => {
    let key = JSON.stringify(args);
      if (key in cache) {
        return cache[key]
      }
    return (cache[key] = fn.call(null, ...args));
  }
  return cacheFn;
};

function double(number) {
	console.log('[double]', number);
	return number * 2;
}

const memoizedDouble = memoize(double);


console.log(memoizedDouble(5));
console.log(memoizedDouble(5));