How To Flatten A Javascript Object Into A Daisy Chain Like Form?

I want to flatten an object like this... var obj1 = { firstName: 'John', lastName: 'Green', car: { make: 'Honda', model: 'Civic', revisions: [ { miles: 1015

Solution 1:

You can create recursive function like this, and its important to store previous keys in one string.

var obj1 = {
  firstName: 'John',
  lastName: 'Green',
  car: {
    make: 'Honda',
    model: 'Civic',
    revisions: [
      { miles: 10150, code: 'REV01', changes: 0},
      { 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' }
  ]
};

functionflatten(data, c) {
  var result = {}
  for(var i in data) {
    if(typeof data[i] == 'object') Object.assign(result, flatten(data[i], c + '.' + i))
    else result[(c + '.' + i).replace(/^\./, "")] = data[i]
  }
  return result
}

console.log(JSON.stringify(flatten(obj1, ''), 0, 4))

Solution 2:

try this:

functionflatten(obj)
{
  var result = {};
  (functionf(e, p) {
    switch (typeof e) {
      case"object":
        p = p ? p + "." : "";
        for (var i in e)
          f(e[i], p + i);
        break;
      default:
        result[p] = e;
        break;
    }
  })(obj);
  return result;
}

var obj1 = {
  firstName: 'John',
  lastName: 'Green',
  car: {
    make: 'Honda',
    model: 'Civic',
    revisions: [{
      miles: 10150,
      code: 'REV01',
    }, {
      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'
  }]
};

console.log(flatten(obj1));

Solution 3:

Here's my code (typesciprt)

exportconstflatten = (data: object, prefix: string = '') => {
  constresult: { [key: string]: string | number | null } = {};

  Object.entries(data).forEach(([key, value]) => {
    if (typeof value === 'object') {
      Object.assign(result, flatten(value, `${prefix}${key}.`));
    } else {
      result[`${prefix}${key}`] = value;
    }
  });

  return result;
};

javascript version

exportconstflatten = (data, prefix = '') => {
  const result = {};

  Object.entries(data).forEach(([key, value]) => {
    if (typeof value === 'object') {
      Object.assign(result, flatten(value, `${prefix}${key}.`));
    } else {
      result[`${prefix}${key}`] = value;
    }
  });

  return result;
};