Trying to get a unique list of objects

Question

I have a collection of objects

var array = 
[
    {"category":"A", "categoryname":"somename", key: 1, description: "something"}, 
    {"category":"A", "categoryname":"somename", key: 1, description: "something"}, 
    {"category":"B", "categoryname": "somename", key: 1, description: "something"}
    {"category":"B", "categoryname": "somename", key: 3, description: "something"}
    {"category":"C", "categoryname": "somename", key: 2, description: "something"}
    {"category":"C", "categoryname": "somename", key: 2, description: "something"}
]

that have 4 values (category, categoryname, key, description) and I need to loop through it and get a unique list of objects based on the category. But I want to return the unique list with 2 preoperties and not just one. If I use

_.uniq(_.pluck(array,"category"))

this gives me what I want except I need the categoryname as well as the category. Is this possible?

What is expected result?

guest271314
– guest271314

2016-10-10 23:35:37 +00:00
Commented Oct 10, 2016 at 23:35 — guest271314
– guest271314, Commented Oct 10, 2016 at 23:35
[ ["A", "somename"],["B","somename"],["C","somename"] ]

chuckd
– chuckd

2016-10-10 23:41:31 +00:00
Commented Oct 10, 2016 at 23:41 — chuckd
– chuckd, Commented Oct 10, 2016 at 23:41

Community · Accepted Answer · 2017-05-23 10:30:19Z

2

There are a couple of questions on the same use case already.

Plucking Multiple Properties

Removing duplicate objects with Underscore for Javascript

edited May 23, 2017 at 10:30

CommunityBot

11 silver badge

answered Oct 10, 2016 at 23:45

Sreekanth

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Comments

guest271314 · Accepted Answer · 2016-10-10 23:49:36Z

You can use $.unique(), Array.prototype.map(), JSON.stringify(), JSON.parse()

var array = [{
  "category": "A",
  "categoryname": "somename",
  key: 1,
  description: "something"
}, {
  "category": "A",
  "categoryname": "somename",
  key: 1,
  description: "something"
}, {
  "category": "B",
  "categoryname": "somename",
  key: 1,
  description: "something"
}, {
  "category": "B",
  "categoryname": "somename",
  key: 3,
  description: "something"
}, {
  "category": "C",
  "categoryname": "somename",
  key: 2,
  description: "something"
}, {
  "category": "C",
  "categoryname": "somename",
  key: 2,
  description: "something"
}];

var res = $.unique(array.map(function(el) {
  return JSON.stringify([el.category, el.categoryname])
})).map(JSON.parse);

console.log(res);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

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