Group objects in Array using reduce

reduce.js

let meetingOriginal = [{
    id: 19,
    datetime: '2019-01-02T13:28:03+05:30',
    status: 'proposed',
    createdBy: 'buyer',
    buyerId: 2,
    buyerFirstName: 'Demo',
    buyerLastName: 'User',
    buyerProfileUrl: null,
    petId: 1,
    petName: 'Penny',
    petMedia: 'https://s3.us-east-2.amazonaws.com/s3-petquest-dev/images/1546324490530.jpg',
    ownerFirstName: 'Faizan',
    ownerLastName: 'Saiyed',
    ownerProfileUrl: null,
    ownerId: 3,
}, {
    id: 20,
    datetime: '2019-01-03T13:28:06+05:30',
    status: 'proposed',
    createdBy: 'buyer',
    buyerId: 2,
    buyerFirstName: 'Demo',
    buyerLastName: 'User',
    buyerProfileUrl: null,
    petId: 1,
    petName: 'Penny',
    petMedia: 'https://s3.us-east-2.amazonaws.com/s3-petquest-dev/images/1546324490530.jpg',
    ownerFirstName: 'Faizan',
    ownerLastName: 'Saiyed',
    ownerProfileUrl: null,
    ownerId: 3,
}, {
    id: 21,
    datetime: '2019-01-04T13:28:09+05:30',
    status: 'proposed',
    createdBy: 'buyer',
    buyerId: 2,
    buyerFirstName: 'Demo',
    buyerLastName: 'User',
    buyerProfileUrl: null,
    petId: 1,
    petName: 'Penny',
    petMedia: 'https://s3.us-east-2.amazonaws.com/s3-petquest-dev/images/1546324490530.jpg',
    ownerFirstName: 'Faizan',
    ownerLastName: 'Saiyed',
    ownerProfileUrl: null,
    ownerId: 3,
}, {
    id: 22,
    datetime: '2019-01-04T13:28:09+05:30',
    status: 'proposed',
    createdBy: 'buyer',
    buyerId: 3,
    buyerFirstName: 'Demo',
    buyerLastName: 'User',
    buyerProfileUrl: null,
    petId: 2,
    petName: 'Jerry',
    petMedia: 'https://static1.squarespace.com/static/52784cdde4b07cdbb003018f/t/56259d40e4b043d43a71cc73/1445305665196/Cavapoo-dog-painting-square-a.jpg?format=500w',
    ownerFirstName: 'Jony',
    ownerLastName: 'Snowy',
    ownerProfileUrl: null,
    ownerId: 5,
}];

let op = meetingOriginal.reduce((o,c)=>{
  if(o[c.buyerId]){
    o[c.buyerId]['meetings'].push({
        id: c.id, datetime: c.dateTime, status: c.status, createdBy: c.createdBy
    })
  } else {
  let  { buyerId,buyerFirstName,buyerLastName,buyerProfileUrl,petId,petName,petMedia,ownerFirstName,ownerLastName,ownerId,ownerProfileUrl} = c
    o[c.buyerId]={buyerId: buyerId, buyerFirstName:buyerFirstName, buyerLastName:buyerLastName, buyerProfileUrl:buyerProfileUrl, petId:petId, petName:petName, petMedia:petMedia, ownerFirstName:ownerFirstName, ownerLastName:ownerLastName, ownerId:ownerId, ownerProfileUrl:ownerProfileUrl, meetings : [{ datetime: c.dateTime, status: c.status, createdBy: c.createdBy }]}}
  return o;
},{})

let finalOp = Object.values(op);
console.log(finalOp)