合并匹配元素并迭代并分离出集合中不匹配的元素

Question

我是 Node\JS 的新手，一直坚持如何在收集中合并匹配元素和迭代不匹配元素以创建新集合。到目前为止，我已经使用 lodash 对下面粘贴（分组输入）的数据进行分组，但无法弄清楚如何获得所需的输出。

我愿意使用 lodash\underscore\javascript 或任何其他与 Node 兼容的库。

感谢您的帮助和建议。

Grouped Input:

[ { mod_AccountNumber: '0001',
    mod_Id: '123456',
    mod_LastName: 'SMITH',
    mod_FirstName: 'NANCY',
    mod_AppointmentLocation: 'ROOM10',
    mod_AppointmentDate: '10/26/18',
    mod_AppointmentTime: '0900' },
  { mod_AccountNumber: '0001',
    mod_Id: '123456',
    mod_LastName: 'SMITH',
    mod_FirstName: 'NANCY',
    mod_AppointmentLocation: 'ROOM11',
    mod_AppointmentDate: '10/26/18',
    mod_AppointmentTime: '0930' },
  { mod_AccountNumber: '0001',
    mod_Id: '654321',
    mod_LastName: 'JONES',
    mod_FirstName: 'NATASHA',
    mod_AppointmentLocation: 'ROOM11',
    mod_AppointmentDate: '10/26/18',
    mod_AppointmentTime: '0930' },
  { mod_AccountNumber: '0001',
    mod_Id: '654321',
    mod_LastName: 'JONES',
    mod_FirstName: 'NATASHA',
    mod_AppointmentLocation: 'ROOM12',
    mod_AppointmentDate: '10/26/18',
    mod_AppointmentTime: '1015' }
]

Desired Output:

[ { mod_AccountNumber: '0001',
    mod_Id: '123456',
    mod_LastName: 'SMITH',
    mod_FirstName: 'NANCY',
    mod_AppointmentLocation_1: 'ROOM10',
    mod_AppointmentTime_1:'0900',
    mod_AppointmentLocation_2: 'ROOM11',
    mod_AppointmentTime_2:'0930' },
  { mod_AccountNumber: '0001',
    mod_Id: '654321',
    mod_LastName: 'JONES',
    mod_FirstName: 'NATASHA',
    mod_AppointmentLocation_1: 'ROOM11',
    mod_AppointmentTime_1:'0930',
    mod_AppointmentLocation_2: 'ROOM12',
    mod_AppointmentTime_2:'1015' }
]

Answer 1

const {groupBy, values, merge} = require('lodash');
// input...
const output = values(
    groupBy(input, 'id')
).map(chunks => merge(...chunks));

Answer 2

整体上更好的方法是将这些日期/时间/位置转换为数组。但是鉴于当前的问题可以这样做：

const data = [{ mod_AccountNumber: '0001', mod_Id: '123456', mod_LastName: 'SMITH', mod_FirstName: 'NANCY', mod_AppointmentLocation: 'ROOM10', mod_AppointmentDate: '10/26/18', mod_AppointmentTime: '0900' }, { mod_AccountNumber: '0001', mod_Id: '123456', mod_LastName: 'SMITH', mod_FirstName: 'NANCY', mod_AppointmentLocation: 'ROOM11', mod_AppointmentDate: '10/26/18', mod_AppointmentTime: '0930' }, { mod_AccountNumber: '0001', mod_Id: '654321', mod_LastName: 'JONES', mod_FirstName: 'NATASHA', mod_AppointmentLocation: 'ROOM11', mod_AppointmentDate: '10/26/18', mod_AppointmentTime: '0930' }, { mod_AccountNumber: '0001', mod_Id: '654321', mod_LastName: 'JONES', mod_FirstName: 'NATASHA', mod_AppointmentLocation: 'ROOM12', mod_AppointmentDate: '10/26/18', mod_AppointmentTime: '1015' } ]

const result = _(data)
 .groupBy('mod_Id')
 .values()
 .map(x => _.values(_.transform(x, (r,c,i) => {
   r[c.mod_Id] = _.extend(r[c.mod_Id], {
   mod_Id: c.mod_Id,
   mod_AccountNumber: c.mod_AccountNumber,
   mod_LastName: c.mod_LastName,
   mod_FirstName: c.mod_FirstName,
   [`mod_AppointmentLocation${i+1}`]: c.mod_AppointmentLocation,
   [`mod_AppointmentDate${i+1}`]: c.mod_AppointmentDate,
   [`mod_AppointmentTime${i+1}`]: c.mod_AppointmentTime,
 })}, {})))
 .flatten()
 .value()

console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>

我们的想法是首先按mod_Id 分组，然后将values map 通过它们和transform 他们带到一个对象。由于您回到了对象形式，您将获得 values 和最后一个 flatten 数组。

更简单的方法是使用 ES6 像这样：

const data = [{ mod_AccountNumber: '0001', mod_Id: '123456', mod_LastName: 'SMITH', mod_FirstName: 'NANCY', mod_AppointmentLocation: 'ROOM10', mod_AppointmentDate: '10/26/18', mod_AppointmentTime: '0900' }, { mod_AccountNumber: '0001', mod_Id: '123456', mod_LastName: 'SMITH', mod_FirstName: 'NANCY', mod_AppointmentLocation: 'ROOM11', mod_AppointmentDate: '10/26/18', mod_AppointmentTime: '0930' }, { mod_AccountNumber: '0001', mod_Id: '654321', mod_LastName: 'JONES', mod_FirstName: 'NATASHA', mod_AppointmentLocation: 'ROOM11', mod_AppointmentDate: '10/26/18', mod_AppointmentTime: '0930' }, { mod_AccountNumber: '0001', mod_Id: '654321', mod_LastName: 'JONES', mod_FirstName: 'NATASHA', mod_AppointmentLocation: 'ROOM12', mod_AppointmentDate: '10/26/18', mod_AppointmentTime: '1015' } ]

const result = Object.values(data.reduce((r, c, i) => {
  let _x = r[c.mod_Id] ? r[c.mod_Id]._x : 0
  _x++
  r[c.mod_Id] = Object.assign(r[c.mod_Id] || {}, {
    mod_Id: c.mod_Id,
    mod_AccountNumber: c.mod_AccountNumber,
    mod_LastName: c.mod_LastName,
    mod_FirstName: c.mod_FirstName,
    [`mod_AppointmentLocation${_x}`]: c.mod_AppointmentLocation,
    [`mod_AppointmentDate${_x}`]: c.mod_AppointmentDate,
    [`mod_AppointmentTime${_x}`]: c.mod_AppointmentTime,
    _x
  })
  return r
}, {})).map(({_x, ...rest}) => rest)
console.log(result)

唯一需要注意的是，这种方法并不纯粹，因为它通过使用_x 属性改变对象来跟踪当前项目编号，最后通过map 剥离该属性

如果您想考虑采用数组的想法，那么事情会变得简单得多：

const data = [{ mod_AccountNumber: '0001', mod_Id: '123456', mod_LastName: 'SMITH', mod_FirstName: 'NANCY', mod_AppointmentLocation: 'ROOM10', mod_AppointmentDate: '10/26/18', mod_AppointmentTime: '0900' }, { mod_AccountNumber: '0001', mod_Id: '123456', mod_LastName: 'SMITH', mod_FirstName: 'NANCY', mod_AppointmentLocation: 'ROOM11', mod_AppointmentDate: '10/26/18', mod_AppointmentTime: '0930' }, { mod_AccountNumber: '0001', mod_Id: '654321', mod_LastName: 'JONES', mod_FirstName: 'NATASHA', mod_AppointmentLocation: 'ROOM11', mod_AppointmentDate: '10/26/18', mod_AppointmentTime: '0930' }, { mod_AccountNumber: '0001', mod_Id: '654321', mod_LastName: 'JONES', mod_FirstName: 'NATASHA', mod_AppointmentLocation: 'ROOM12', mod_AppointmentDate: '10/26/18', mod_AppointmentTime: '1015' } ]

const result = _.chain(data)
  .reduce((r,c,i) => {
  r[c.mod_Id] = r[c.mod_Id] ? r[c.mod_Id] : {
    mod_Id: c.mod_Id,
    mod_AccountNumber: c.mod_AccountNumber,
    mod_LastName: c.mod_LastName,
    mod_FirstName: c.mod_FirstName,
    schedule: []
  }
  r[c.mod_Id].schedule.push({
    mod_AppointmentLocation: c.mod_AppointmentLocation,
    mod_AppointmentDate: c.mod_AppointmentDate,
    mod_AppointmentTime: c.mod_AppointmentTime
  })
  return r
 }, {})
 .values()
 .value()
 
console.log(result)

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.10/lodash.min.js"></script>