JS Mapping对象拾取嵌套的数组键值，使其成为更高级别的键值

function pickNestedKeyValue(arr) {
  const mapping = new Map();

  function pick(obj, prefix = '') {
    for (const [key, value] of Object.entries(obj)) {
      const newKey = prefix ? `${prefix}.${key}` : key;
      if (Array.isArray(value)) {
        pickNestedArray(value, newKey);
      } else if (typeof value === 'object' && value !== null) {
        pick(value, newKey);
      } else {
        mapping.set(newKey, value);
      }
    }
  }

  function pickNestedArray(arr, prefix = '') {
    arr.forEach((element, index) => {
      const newKey = prefix ? `${prefix}[${index}]` : `[${index}]`;
      if (Array.isArray(element)) {
        pickNestedArray(element, newKey);
      } else if (typeof element === 'object' && element !== null) {
        pick(element, newKey);
      } else {
        mapping.set(newKey, element);
      }
    });
  }

  pick(arr);

  return mapping;
}

// 使用示例
const nestedArray = [
  {
    name: 'Alice',
    age: 25,
    hobbies: ['reading', 'painting'],
    address: {
      city: 'New York',
      country: 'USA'
    }
  },
  {
    name: 'Bob',
    age: 30,
    hobbies: ['coding', 'music'],
    address: {
      city: 'London',
      country: 'UK'
    }
  }
];

const result = pickNestedKeyValue(nestedArray);
console.log(result);