lodash/underscore; compare two objects and remove duplicates

Question

As you can see in the image below, I have some returned json data with three objects; each contains a clients id => data.

exact_match : {104}
match_4 :  {104, 103}
match_2 :  {104, 103, 68}

How can I "trim" or remove the duplicate objects based on previous ones? something like:

exact_match : {104}
match_4 :  {103}
match_2 :  {68}

I tried _.difference but did not work (Maybe because it is for arrays not objects?):

var exact_match = data.exact_match,
    match_four_digits = _.difference(data.match_4, data.exact_match),
    match_two_digits = _.difference(data.match_2, data.exact_match, data.match_4),

Any help would be appreciated :)

Update

I need that the returned value has the same object data instead of a new array :)

Answer 1

It looks like you want to diff keys (or rather, it'd be efficient to — _.keys)

_.difference(
  _.keys({104: 1, 102: 3, 101: 0}), // ["104", "102", "101"]
  _.keys({104: 1, 102: 3}) // ["104", "102"]
)
// [ "101" ]

Or, you could always convert your object to an array of pairs if you want to compare within the objects too (_.pairs):

_.difference(
  _.pairs({104: 1, 102: 3, 101: 0}), // [["104",1], ["102",3], ["101",0]]
  _.pairs({104: 1, 102: 2}) // [["104",1], ["102",2]]
)
// [["102", 3], ["101", 0]]