javascript json data map issue-CodePudding

[
  {
    personId: 1,
    name: 'John',
    surName: 'Sur',
    bookId: 1,
    bookName: 'Lord of the ring',
    updated_at: 2022-01-24T19:20:53.742Z,
    deliver__date: null
  },
  {
    personId: 1,
    name: 'John',
    surName: 'Sur',
    bookId: 2,
    bookName: 'Fableheaven',
    updated_at: 2022-01-24T19:21:57.813Z,
    deliver__date: null
  },
 {
    personId: 1,
    name: 'John',
    surName: 'Sur',
    bookId: 3,
    bookName: 'Some Book',
    updated_at: 2022-01-24T19:21:57.813Z,
    deliver__date: null
  }
]

I wanna do this json data like this [{ personId:1 name:"John", surName:"Sur", lend:{..rest} }]

but I can't how can do this thanks for help for now.

CodePudding user response：

result = arr.map(el => {
return {
personId: el.personId,
name: el.name,
surName: el.surName,
lend: {
bookId: el.bookId,
bookNme: el.bookName,
updated_at: el.updated_at,
deliver__date: el.deliver__date} }})

CodePudding user response：

Im not sure if I got your requirements correctly, but do you mean this?

const obj = [ { personId: 1, name: 'John', surName: 'Sur', bookId: 1, bookName: 'Lord of the ring', updated_at: '2022-01-24T19:20:53.742Z', deliver__date: null }, { personId: 1, name: 'John', surName: 'Sur', bookId: 2, bookName: 'Fableheaven', updated_at: '2022-01-24T19:21:57.813Z', deliver__date: null }, { personId: 1, name: 'John', surName: 'Sur', bookId: 3, bookName: 'Some Book', updated_at: '2022-01-24T19:21:57.813Z', deliver__date: null } ]

console.log(obj.map((el)=>({personId: el.personId, name: el.name, surName: el.surName, 
lend: {bookId: el.bookId, bookName: el.bookName, updated_at: el.updated_at, deliver__date: el.deliver__date}})));

CodePudding user response：

I don't think it will be a single-line and optimized way to aggregate the data (if that is your intention, otherwise the @MWO answer already have what you need), so, I would do something like this:

const data = [{
    personId: 1,
    name: 'John',
    surName: 'Sur',
    bookId: 1,
    bookName: 'Lord of the ring',
    updated_at: '2022 - 01 - 24 T19: 20: 53.742 Z',
    deliver__date: null
  },
  {
    personId: 1,
    name: 'John',
    surName: 'Sur',
    bookId: 2,
    bookName: 'Fableheaven',
    updated_at: '2022 - 01 - 24 T19: 21: 57.813 Z',
    deliver__date: null
  },
  {
    personId: 1,
    name: 'John',
    surName: 'Sur',
    bookId: 3,
    bookName: 'Some Book',
    updated_at: '2022 - 01 - 24 T19: 21: 57.813 Z',
    deliver__date: null
  }
];

function aggregateByPerson(input) {
  const map = {};
  input.forEach(entry => {
    const {
      personId,
      name,
      surName,
      ...lend
    } = entry;
    if (map[entry.personId]) {
      map[entry.personId].lend.push(lend);
    } else {
      map[entry.personId] = {
        personId,
        name,
        surName,
        lend: [lend]
      };
    }
  });

  return Object.values(map);
}

console.log(aggregateByPerson(data));

CodePudding user response：

It seems like you want to use "Rest Parameters" by the language of your question. More Info

const input = [
  {
    personId: 1,
    name: 'John',
    surName: 'Sur',
    bookId: 1,
    bookName: 'Lord of the ring',
    updated_at: '2022-01-24T19:20:53.742Z',
    deliver__date: null
  },
  {
    personId: 1,
    name: 'John',
    surName: 'Sur',
    bookId: 2,
    bookName: 'Fableheaven',
    updated_at: '2022-01-24T19:21:57.813Z',
    deliver__date: null
  },
 {
    personId: 1,
    name: 'John',
    surName: 'Sur',
    bookId: 3,
    bookName: 'Some Book',
    updated_at: '2022-01-24T19:21:57.813Z',
    deliver__date: null
  }
];

const output = input.map(({personId, name, surName, ...rest}) => ({
  personId,
  name,
  surName,
  rest
}));

console.log(output);