JavaScript comparing and returning differences between Objects

Question

Folks, Given the following 2 Objects, what would be the best way to compare them, and return only the differences between them?

{ _id: 530797d8952e10129f97fde3,
  Product: 'something',
  Realm: [ 'something', 'something','foo' ],
  Service: 'Node',
  Owners: [ 'foo', 'something' ],
  Project: 'something',
  URLs:
    [ { 'foo': [Object] },
      { 'foo': [Object] },
      { 'foo': [Object] } ] }

...

{ _id: 530797d8952e10129f97fde3,
  Product: 'something',
  Realm: [ 'something', 'something','foo' ],
  Service: 'Node',
  Owners: [ 'foo', 'something' ],
  Project: 'something',
  URLs:
    [ { 'bar': [Object] },
      { 'foo': [Object] },
      { 'quux': [Object] } ] }

Should I loop through these and compare, or is there a pre-built module people use?

Thanks!

I haven't heard of such a module. Anyway, you should also post the expected outcome of the code, the differences. — Tibos
– Tibos, Commented Feb 25, 2014 at 20:20
If you just want to compare and check if they are the same, you could use underscore - _.isEqual() underscorejs.org/#isEqual You could also look into isEqual() source to get some idea - github.com/jashkenas/underscore/blob/master/underscore.js. — palanik
– palanik, Commented Feb 25, 2014 at 20:21
I'm not aware of any module that would return the difference between objects, but a simple recursive function would do. If the objects are not equals by using the _.isEqual as mentioned by @palanik it doesn't worth the extra step of checking.. — Gntem
– Gntem, Commented Feb 25, 2014 at 20:59
Maybe you can start our with the comparison methods here: stackoverflow.com/questions/1068834/…. And build one to return an object with only the differences? — Spork
– Spork, Commented Feb 25, 2014 at 23:28

J David Smith · Accepted Answer · 2014-02-25 23:32:23Z

1

There is a fantastic node.js module written by flitbit that will do exactly what you desire: deep-diff.

I won't go into to much detail about it (the module page is well-written), but it will compute the difference between two objects and given you a detailed output describing it. The output includes whether a property is new/deleted or merely has a different value.

answered Feb 25, 2014 at 23:32

J David Smith

4,8301 gold badge21 silver badges24 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

JavaScript comparing and returning differences between Objects

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related