如何聚合集合中的嵌套字段？

const data = [
  { id: 1, details: { value: 10 } },
  { id: 2, details: { value: 20 } },
  { id: 3, details: { value: 30 } }
];

// 提取嵌套字段并聚合
const aggregatedValue = data.reduce((sum, item) => {
  return sum + item.details.value;
}, 0);

console.log(aggregatedValue); // 输出: 60

const data = [
  { id: 1, details: { value: 10 } },
  { id: 2 }, // 缺少 details 字段
  { id: 3, details: { value: 30 } }
];

const aggregatedValue = data.reduce((sum, item) => {
  return sum + (item.details && item.details.value ? item.details.value : 0);
}, 0);

console.log(aggregatedValue); // 输出: 40

const data = [
  { id: 1, details: { value: "10" } },
  { id: 2, details: { value: 20 } },
  { id: 3, details: { value: "30" } }
];

const aggregatedValue = data.reduce((sum, item) => {
  const value = typeof item.details.value === 'string' ? parseInt(item.details.value, 10) : item.details.value;
  return sum + value;
}, 0);

console.log(aggregatedValue); // 输出: 60