1const items = [
2  { category: 'fruit', name: 'apple', count: 10 },
3  { category: 'fruit', name: 'banana', count: 5 },
4  { category: 'vegetable', name: 'carrot', count: 7 },
5  { category: 'fruit', name: 'orange', count: 8 },
6  { category: 'vegetable', name: 'broccoli', count: 3 },
7];
8
9const summary = items.reduce((acc, item) => {
10  if (!acc[item.category]) {
11    acc[item.category] = 0;
12  }
13  acc[item.category] += item.count;
14  return acc;
15}, {});