如何在重复元素中创建带有sum字段的集合？

function createCollectionWithSum(arr) {
  // 使用哈希表记录元素的出现次数
  const countMap = new Map();
  for (let i = 0; i < arr.length; i++) {
    const element = arr[i];
    if (countMap.has(element)) {
      countMap.set(element, countMap.get(element) + 1);
    } else {
      countMap.set(element, 1);
    }
  }

  // 创建带有sum字段的集合
  const collectionWithSum = [];
  countMap.forEach((count, element) => {
    const obj = {
      value: element,
      sum: count
    };
    collectionWithSum.push(obj);
  });

  return collectionWithSum;
}

// 示例用法
const arr = [1, 2, 2, 3, 3, 3];
const result = createCollectionWithSum(arr);
console.log(result);

[
  { value: 1, sum: 1 },
  { value: 2, sum: 2 },
  { value: 3, sum: 3 }
]