CODEWITHSUNDEEP
javascript
Ashish Bairwa
Ashish Bairwa

Reputation: 775

Creating another differently formatted js object from an existing js object

I have a function which is returning a js object in this format

{ _id: { day: 21, month: 10, year: 2020 },
  TOTAL: 9,
  A: 4,
  B: 1,
  C: 1,
  D: 2 }

and I have to format the above one into this format:

{ modalities:
   { TOTAL: { '21-09-2020': 2, '20-10-2020': 1, '21-10-2020': 8 },
     A: { '21-09-2020': 1, '21-10-2020': 4 },
     B: { '21-10-2020': 1 },
     C: { '21-09-2020': 1, '21-10-2020': 1 },
     D: { '20-10-2020': 1, '21-10-2020': 2 } } }

as a beginner, I don't have much experience with formatting and right now I'm thinking to implement this with forEach. Is there any better way to do it in javascript?

Upvotes: 0

Views: 77

Answers (2)

Jagdish Idhate
Jagdish Idhate

Reputation: 7742

You can use .reduce as below, by iterating over objects and merging them into single object.

Below code will add any dynamic keys as well, except _id, (if you want you can hardcode keys if you want strict schema).

const temp = [{"_id":{"day":21,"month":10,"year":2020},"TOTAL":9,"XR":4,"CT":1,"MR":1,"MG":2},{"_id":{"day":20,"month":10,"year":2020},"TOTAL":1,"XR":0,"CT":0,"MR":0,"MG":1},{"_id":{"day":21,"month":9,"year":2020},"TOTAL":2,"XR":1,"CT":0,"MR":1,"MG":0}];

const result = temp.reduce((res, obj) => {
  const id = `${obj._id.day}-${obj._id.month}-${obj._id.year}`;
  for (let key in obj) {
    if (key === '_id') // Skip _id, as we don't want in resulting object
      continue;
    if(obj[key]){  // As OP output skips 0 valued keys
      res.modalities[key] = res.modalities[key] || {};
      res.modalities[key][id] = obj[key];
   }
  }
  return res;
}, {modalities:{}});

console.log(result)

Upvotes: 1

Simon
Simon

Reputation: 379

let data = [
  {
    "_id": {
      "day": 21,
      "month": 10,
      "year": 2020
    },
    "TOTAL": 9,
    "XR": 4,
    "CT": 1,
    "MR": 1,
    "MG": 2
  },
  {
    "_id": {
      "day": 20,
      "month": 10,
      "year": 2020
    },
    "TOTAL": 1,
    "XR": 0,
    "CT": 0,
    "MR": 0,
    "MG": 1
  },
  {
    "_id": {
      "day": 21,
      "month": 9,
      "year": 2020
    },
    "TOTAL": 2,
    "XR": 1,
    "CT": 0,
    "MR": 1,
    "MG": 0
  }
];

let result = {
    modalities: {
        TOTAL: {},
        XR: {},
        CT: {},
        MR: {},
        MG: {}
    }
};

for (let element of data) {
    let date = element._id.day + '-' + element._id.month + '-' + element._id.year;
    result.modalities.TOTAL[date] = element.TOTAL;
    result.modalities.XR[date] = element.XR;
    result.modalities.CT[date] = element.CT;
    result.modalities.MR[date] = element.MR;
    result.modalities.MG[date] = element.MG;
}

console.log('result: ' + JSON.stringify(result));

sample output

result: {
  "modalities": {
    "TOTAL": {
      "21-10-2020": 9,
      "20-10-2020": 1,
      "21-9-2020": 2
    },
    "XR": {
      "21-10-2020": 4,
      "20-10-2020": 0,
      "21-9-2020": 1
    },
    "CT": {
      "21-10-2020": 1,
      "20-10-2020": 0,
      "21-9-2020": 0
    },
    "MR": {
      "21-10-2020": 1,
      "20-10-2020": 0,
      "21-9-2020": 1
    },
    "MG": {
      "21-10-2020": 2,
      "20-10-2020": 1,
      "21-9-2020": 0
    }
  }
}

Upvotes: 1

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