memoization-func.js

const getMemoizationSum = () => {
  const cache = new Map();

  return (a, b) => {
    const cacheKey = `${a}+${b}`;
    const cachedValue = cache.get(cacheKey);
    if (cachedValue) {
      console.log('cached')
      return cachedValue;
    }
    console.log('notCached')
    const sum = a + b;
    cache.set(cacheKey, sum)
    return sum
  }
}

const sum = getMemoizationSum();
sum(1, 1);
sum(1, 1);
sum(1, 2);
sum(1, 3);
sum(1, 1);