const inventory = {
  apples: 5,
  bananas: 0,
  cherries: 12,
  dates: undefined,
  elderberries: null,
};

const summary = Object.entries(inventory)
  .filter(([_, value]) => value)
  .reduce((acc, [key, value]) => {
    acc[key] = value * 2;
    return acc;
  }, {});

console.log(Object.keys(summary).length);
console.log(Object.values(summary).every(v => v > 10));
console.log(Object.keys(inventory).length === Object.keys(summary).length);