重构嵌套对象

const nestedObject = {
  id: 1,
  name: 'John',
  address: {
    street: '123 Main St',
    city: 'Anytown',
    zip: '12345'
  },
  contacts: [
    { type: 'email', value: 'john@example.com' },
    { type: 'phone', value: '555-1234' }
  ]
};

function flattenObject(obj, prefix = '') {
  const result = {};
  for (const key in obj) {
    if (typeof obj[key] === 'object' && !Array.isArray(obj[key])) {
      Object.assign(result, flattenObject(obj[key], prefix + key + '.'));
    } else if (Array.isArray(obj[key])) {
      obj[key].forEach((item, index) => {
        Object.assign(result, flattenObject(item, prefix + key + '[' + index + '].'));
      });
    } else {
      result[prefix + key] = obj[key];
    }
  }
  return result;
}

const flattenedObject = flattenObject(nestedObject);
console.log(flattenedObject);

{
  id: 1,
  name: 'John',
  address.street: '123 Main St',
  address.city: 'Anytown',
  address.zip: '12345',
  contacts[0].type: 'email',
  contacts[0].value: 'john@example.com',
  contacts[1].type: 'phone',
  contacts[1].value: '555-1234'
}

function flattenObject(obj, prefix = '', visited = new Set()) {
  if (visited.has(obj)) return {};
  visited.add(obj);
  const result = {};
  for (const key in obj) {
    if (typeof obj[key] === 'object' && !Array.isArray(obj[key])) {
      Object.assign(result, flattenObject(obj[key], prefix + key + '.', visited));
    } else if (Array.isArray(obj[key])) {
      obj[key].forEach((item, index) => {
        Object.assign(result, flattenObject(item, prefix + key + '[' + index + '].', visited));
      });
    } else {
      result[prefix + key] = obj[key];
    }
  }
  return result;
}