CODEWITHSUNDEEP
node.jsdictionary
Adam
Adam

Reputation: 20882

NodeJS - Convert Array of Objects into Object of Objects

I'm trying to convert this data - Array of Objects

const data = [
  {
    userid: 100,
    text: 'yea',
    new: true,
    datetime: 2018-09-04T20:21:17.000Z
  },
  {
    userid: 101,
    text: 'its heading to another new year... wow the time flies...',
    new: true,
    datetime: 2018-09-03T21:51:27.000Z
  },
  {
    userid: 102,
    text: 'wish you the same ...thanks',
    new: true,
    datetime: 2018-01-12T01:36:28.000Z
  }
]

Into the following Structure - Object of Objects

{
    100: {
        userid: 100,
        text: 'yea',
        new: true,
        datetime: 2018-09-04T20:21:17.000Z
    },
    101: {
        userid: 101,
        text: 'its heading to another new year... wow the time flies...',
        new: true,
        datetime: 2018-09-03T21:51:27.000Z
      },
     102: {
        userid: 102,
        text: 'wish you the same ...thanks',
        new: true,
        datetime: 2018-01-12T01:36:28.000Z
      }
}

I've tried

messages.map((data) => ({[Math.round(new Date(data.datetime).getTime() / 1000)]: data}))

and I get the structure but map returns an array and I need an object. Been playing with reduce() - no luck yet..

thankyou

Upvotes: 1

Views: 188

Answers (3)

ShawnTan
ShawnTan

Reputation: 45

You can try this with reduce

const data = [
    {
        userid: 100,
        text: 'yea',
        new: true,
        datetime: `2018-09-04T20:21:17.000Z`
    },
    {
        userid: 101,
        text: 'its heading to another new year... wow the time flies...',
        new: true,
        datetime: `2018-09-03T21:51:27.000Z`
    },
    {
        userid: 102,
        text: 'wish you the same ...thanks',
        new: true,
        datetime: `2018-01-12T01:36:28.000Z`
    }];

const a = data.reduce((acc, i) => ({...acc,[i.userid]:i}), {})
console.log(a);

Upvotes: 1

Ashok Kumar
Ashok Kumar

Reputation: 326

This will work

const data = [
    {
        userid: 100,
        text: 'yea',
        new: true,
        datetime: `2018-09-04T20:21:17.000Z`
    },
    {
        userid: 101,
        text: 'its heading to another new year... wow the time flies...',
        new: true,
        datetime: `2018-09-03T21:51:27.000Z`
    },
    {
        userid: 102,
        text: 'wish you the same ...thanks',
        new: true,
        datetime: `2018-01-12T01:36:28.000Z`
    }];

    const result = {};

    data.map((a) => {
      result[a.userid] = a;
      return a;
    });

    console.log(result)

Upvotes: 1

CertainPerformance
CertainPerformance

Reputation: 370699

After mapping, use Object.fromEntries to turn each sub-array of [key, value]s into a property on the resulting object:

const data = [
  {
    userid: 100,
    text: 'yea',
    new: true,
    datetime: `2018-09-04T20:21:17.000Z`
  },
  {
    userid: 101,
    text: 'its heading to another new year... wow the time flies...',
    new: true,
    datetime: `2018-09-03T21:51:27.000Z`
  },
  {
    userid: 102,
    text: 'wish you the same ...thanks',
    new: true,
    datetime: `2018-01-12T01:36:28.000Z`
  }
];

const obj = Object.fromEntries(
  data.map(obj => [obj.userid, obj])
);
console.log(obj);

Upvotes: 2

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