Return the same values with count in a JSON Array, Javascript

Question

My data seems to be like this:

const myObj = {
  "incidents": [{
    "id": 4,
    "fullName": "edsadas",
    "address": "Bagbaguin, Pandi, Bulacan",
  }, {
    "id": 5,
    "fullName": "reasdsa",
    "address": "Dalig, Balagtas, Bulacan",
  }, {
    "id": 6,
    "fullName": "dsa",
    "address": "Dalig, Balagtas, Bulacan",
  }],
}

My question, how can i return the similar values with count, like this:

{
  "Dalig, Balagtas, Bulacan": 2,
  "Bagbaguin, Pandi, Bulacan": 1
}

the address key

Rannie Ollit
– Rannie Ollit

2018-03-06 17:27:21 +00:00
Commented Mar 6, 2018 at 17:27 — Rannie Ollit
– Rannie Ollit, Commented Mar 6, 2018 at 17:27
There is some difference between same and similar...

Mohammad Usman
– Mohammad Usman

2018-03-06 17:27:53 +00:00
Commented Mar 6, 2018 at 17:27 — Mohammad Usman
– Mohammad Usman, Commented Mar 6, 2018 at 17:27
ill edit the question, sorry man

Rannie Ollit
– Rannie Ollit

2018-03-06 17:28:33 +00:00
Commented Mar 6, 2018 at 17:28 — Rannie Ollit
– Rannie Ollit, Commented Mar 6, 2018 at 17:28

Ele · Accepted Answer · 2018-03-06 17:53:36Z

5

You can use the function reduce:

var obj = {  "incidents": [{      "id": 4,      "fullName": "edsadas",      "address": "Bagbaguin, Pandi, Bulacan",    },    {      "id": 5,      "fullName": "reasdsa",      "address": "Dalig, Balagtas, Bulacan",    },    {      "id": 6,      "fullName": "dsa",      "address": "Dalig, Balagtas, Bulacan",    }  ]};
var result = obj.incidents.reduce((a, c) => {
            a[c.address] = (a[c.address] || 0) + 1
            return a;
         }, {});

console.log(result);

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

Using reduce and comma operator:

var obj = {  "incidents": [{      "id": 4,      "fullName": "edsadas",      "address": "Bagbaguin, Pandi, Bulacan",    },    {      "id": 5,      "fullName": "reasdsa",      "address": "Dalig, Balagtas, Bulacan",    },    {      "id": 6,      "fullName": "dsa",      "address": "Dalig, Balagtas, Bulacan",    }  ]},         
    result = obj.incidents
                .reduce((a, c) => (a[c.address] = (a[c.address] || 0) + 1, a), {});

console.log(result);

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

edited Mar 6, 2018 at 17:53

answered Mar 6, 2018 at 17:28

Ele

33.8k7 gold badges43 silver badges80 bronze badges

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

3 Comments

Mohammad Usman Over a year ago

Ele, your solution is perfect. It could be even more compact using comma operator. Fiddle

user9366559 Over a year ago

Ugh, please don't use the comma operator for this. It does nothing to add clarity to the code.

Mohammad Usman Over a year ago

@RannieOllit Thank you is also good, but accepting the answer that solved your problem is a better way :)

Suren Srapyan · Accepted Answer · 2018-03-06 17:29:07Z

1

You can iterate over them and increment the value every time. If not found just assign 1

const data = [
  {
     "id": 4,
     "fullName": "edsadas",
     "address": "Bagbaguin, Pandi, Bulacan",
  },
  {
     "id": 5,
     "fullName": "reasdsa",
     "address": "Dalig, Balagtas, Bulacan",
  },
  {
     "id": 6,
     "fullName": "dsa",
     "address": "Dalig, Balagtas, Bulacan",
}];

const count = data.reduce((acc, item) => (acc[item.address] = acc[item.address] ? acc[item.address] + 1 : 1, acc), {});

console.log(count);

answered Mar 6, 2018 at 17:29

Suren Srapyan

68.9k14 gold badges128 silver badges119 bronze badges

Collectives™ on Stack Overflow

Return the same values with count in a JSON Array, Javascript

2 Answers 2

3 Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related