জাভাস্ক্রিপ্টে ফ্ল্যাট অবজেক্টকে নেস্টেড অবজেক্ট এবং অ্যারেতে রূপান্তর করা

ধরুন, আমাদের নিচের মতো একটি অবজেক্ট আছে:

const obj = {
  "firstName": "John",
  "lastName": "Green",
  "car.make": "Honda",
  "car.model": "Civic",
  "car.revisions.0.miles": 10150,
  "car.revisions.0.code": "REV01",
  "car.revisions.0.changes": "",
  "car.revisions.1.miles": 20021,
  "car.revisions.1.code": "REV02",
  "car.revisions.1.changes.0.type": "asthetic",
  "car.revisions.1.changes.0.desc": "Left tire cap",
  "car.revisions.1.changes.1.type": "mechanic",
  "car.revisions.1.changes.1.desc": "Engine pressure regulator",
  "visits.0.date": "2015-01-01",
  "visits.0.dealer": "DEAL-001",
  "visits.1.date": "2015-03-01",
  "visits.1.dealer": "DEAL-002"
};

আমাদের একটি জাভাস্ক্রিপ্ট ফাংশন লিখতে হবে যা এমন একটি অবজেক্ট গ্রহণ করে এবং এটিকে নেস্টেড অবজেক্ট এবং অ্যারেতে আনফ্ল্যাটেন করে।

অতএব, উপরের অ্যারেতে আউটপুট হবে:

const output = {
  firstName: 'John',
  lastName: 'Green',
  car: {
    make: 'Honda',
    model: 'Civic',
    revisions: [
      { miles: 10150, code: 'REV01', changes: ''},
      { miles: 20021, code: 'REV02', changes: [
        { type: 'asthetic', desc: 'Left tire cap' },
        { type: 'mechanic', desc: 'Engine pressure regulator' }
      ]}
    ]
  },
  visits: [
    { date: '2015-01-01', dealer: 'DEAL-001' },
    { date: '2015-03-01', dealer: 'DEAL-002' }
  ]
};

উদাহরণ

const obj = {
  "firstName": "John",
  "lastName": "Green",
  "car.make": "Honda",
  "car.model": "Civic",
  "car.revisions.0.miles": 10150,
  "car.revisions.0.code": "REV01",
  "car.revisions.0.changes": "",
  "car.revisions.1.miles": 20021,
  "car.revisions.1.code": "REV02",
  "car.revisions.1.changes.0.type": "asthetic",
  "car.revisions.1.changes.0.desc": "Left tire cap",
  "car.revisions.1.changes.1.type": "mechanic",
  "car.revisions.1.changes.1.desc": "Engine pressure regulator",
  "visits.0.date": "2015-01-01",
  "visits.0.dealer": "DEAL-001",
  "visits.1.date": "2015-03-01",
  "visits.1.dealer": "DEAL-002"
};
const unflatten = (obj = {}) => {
  const result = {};
  let temp, substrings, property, i;
  for (property in obj) {
    substrings = property.split('.');
    temp = result;
    for (i = 0; i < substrings.length - 1; i++) {
      if (!(substrings[i] in temp)) {
        if (isFinite(substrings[i + 1])) {
          temp[substrings[i]] = [];
        }
        else {
          temp[substrings[i]] = {};
        }
      }
      temp = temp[substrings[i]];
    }
    temp[substrings[substrings.length - 1]] = obj[property];
  }
  return result;
};
console.log(JSON.stringify(unflatten(obj), undefined, 4));

আউটপুট

কনসোলে আউটপুট হবে:

{
  "firstName": "John",
  "lastName": "Green",
  "car": {
    "make": "Honda",
    "model": "Civic",
    "revisions": [
      {
        "miles": 10150,
        "code": "REV01",
        "changes": ""
      },
      {
        "miles": 20021,
        "code": "REV02",
        "changes": [
          {
            "type": "asthetic",
            "desc": "Left tire cap"
          },
          {
            "type": "mechanic",
            "desc": "Engine pressure regulator"
          }
        ]
      }
    ]
  },
  "visits": [
    {
      "date": "2015-01-01",
      "dealer": "DEAL-001"
    },
    {
      "date": "2015-03-01",
      "dealer": "DEAL-002"
    }
  ]
}