数组对象根据某个值过滤重复的数据，并累加某个值

const arr = [
  { id: 1, count: 2 },
  { id: 2, count: 1 },
  { id: 1, count: 3 },
  { id: 3, count: 4 },
  { id: 2, count: 2 }
];

const filteredArr = arr.reduce((accumulator, current) => {
  const existingItem = accumulator.find(item => item.id === current.id);
  if (existingItem) {
    existingItem.count += current.count;
  } else {
    accumulator.push(current);
  }
  return accumulator;
}, []);

console.log(filteredArr);