Compare value of two property in object and change flag to true if value different

Question

I have below object and want to boolean flag true if new value different form old value and false if not

Original object:

{ 
  userName: '[email protected]',
  email: '[email protected]',
  firstName: 'Naresh',
  lastName: 'Kumar',   
  oldEmail: '[email protected]',
  oldFirstName: 'Rakesh',
  oldLastName: 'Kumar'
}

After transformation:

{ 
  userName: '[email protected]',
  email: '[email protected]',
  firstName: 'Naresh',
  lastName: 'Kumar',

  isFirstNameChanged: true,
  isEmailChanged: true,
  isFirstNameChanged: false,

  oldEmail: '[email protected]',
  oldFirstName: 'Rakesh',
  oldLastName: 'Kumar'
}

Is there any way to do it in lodash?

which two values to be compare? & do you want to modify the same object or create new object? — brk, Feb 21 '18 at 07:34
oldemail to email, firstName to oldFirstName and lastName to oldLastName — Rakesh Kumar, Feb 21 '18 at 07:35
`obj.isFirstNameChanged = obj.firstName !== obj.oldFirstName`. Repeat for each of the others. — Dan D., Feb 21 '18 at 07:37
Maybe you can use a getter\settter property.. https://stackoverflow.com/questions/10592753/how-to-define-setter-getter-on-prototype — Amir Popovich, Feb 21 '18 at 07:59

score 1 · Answer 1 · answered Feb 21 '18 at 07:39

You could use an array with the keys for updating the properties with a check.

function update(object) {
    const capitalize = s => s[0].toUpperCase() + s.slice(1);
    
    ['firstName', 'lastName', 'email'].forEach(k => object['is' + capitalize(k) + 'Changed'] = object[k] === object['old' + capitalize(k)]);
}

var object = { userName: '[email protected]', email: '[email protected]', firstName: 'Naresh', lastName: 'Kumar', oldEmail: '[email protected]', oldFirstName: 'Rakesh', oldLastName: 'Kumar' };

update(object);

console.log(object);

.as-console-wrapper { max-height: 100% !important; top: 0; }

Compare value of two property in object and change flag to true if value different

1 Answers1