1. 对象子结构 subObj.

const obj = {
  nice: {
    good: {
      better: '好',
      worse: '差'
    },
    bad: { }
  }
}

const b = {
  nice: {
    good: {
      better: '好'
    }
  }
}

2. 同key映射.

const a = {
  text: 'liu',
  type: 'big',
}
const b = {
  text: '刘',
  type: 'big'
}

3. 对象转置/数组转置.

// 3. 对象转置/数组转置.
const a = [
  {
    id: '11',
    name: 'nihao'
  },
  {
    id: '12',
    name: 'dalao'
  }
]

const b = {
  id: ['11', '12'],
  name: ['nihao', 'dalao']
}

4. 状态路径选择.

// 例如用于构建权限的映射表的配置数据.
const config  = {
  attendee : {
    inMeeting: [0, 1]
    endMeeting: [0, 3],
  },
  compere: {
    inMeeting: [0, 1]
    endMeeting: [1, 1],
  }
}