Loop through array of object and get values

Question

I have below object and i need counts from the byPerson array inside the object. Basically, i want to check the count in each byPerson array elements and get those properties as an array.

for e.g.

var Closed = [16, 0, 1, 43] // here 1st count object has 16 as closed, 2nd count object has no closed property (so we set it to 0), 3rd one has value 1 and 4th one has value 43

Similarly var Verify = [0, 5, 0, 1]

How can i achieve this calculation and stored the results in Closed and Verify variables as shown above.

{
  "byPerson": [
    {
      "personId": "1514903899",
      "firstName": "Yatish",
      "lastName": "Patel",
      "count": {
        "Closed": 16,
      }
    },
    {
      "personId": "1559363884",
      "firstName": "Samuel",
      "lastName": "Chacko",
      "count": {
        "Verify": 5
      }
    },
    {
      "personId": "297895805",
      "firstName": "Tim",
      "lastName": "Altman",
      "count": {
        "Closed": 1
      }
    },
    {
      "personId": "others",
      "firstName": "Others",
      "lastName": "",
      "count": {
        "Closed": 43,
        "Verify": 1
      }
    }
  ],
  "resultDateTime": "2021-04-23T12:14:33.901"
}

I tried this way

const closedValues= releaseData.byPerson.map(element => element.count["Closed"] === undefined ? 0: element.count["Closed"]);
const verifyValues= releaseData.byPerson.map(element => element.count["Verify"] === undefined ? 0: element.count["Verify"]);
    ```

But i guess it is not the optimal solution where i have to calculate for each one seperately.

If you are using ES6 and you object is called "jsonData" : const byPerson = jsonData.byPerson; const Closed = []; const Verify = []; for(let i=0; i<byPerson.length;++i) { Closed.push( (byPerson[i].count?.Closed) ? +byPerson[i].count.Closed : 0 ); Verify.push( (byPerson[i].count?.Verify) ? +byPerson[i].count.Verify: 0 ); } console.log(Closed, Verify); — Coolhand
– Coolhand, Commented Apr 27, 2021 at 18:52
@ArenTrot -- Since the question is closed (I voted to re-open) .. I created a Fiddle for you HERE If that is what you're looking for .. I'll answer the question (with explanation) once re-opened — Zak
– Zak, Commented Apr 27, 2021 at 19:58

T J · Accepted Answer · 2021-04-27 18:51:53Z

2

You can use Array.reduce to count this in one go:

const data = {
  "byPerson": [{
      "personId": "1514903899",
      "firstName": "Yatish",
      "lastName": "Patel",
      "count": {
        "Closed": 16,
      }
    },
    {
      "personId": "1559363884",
      "firstName": "Samuel",
      "lastName": "Chacko",
      "count": {
        "Verify": 5
      }
    },
    {
      "personId": "297895805",
      "firstName": "Tim",
      "lastName": "Altman",
      "count": {
        "Closed": 1
      }
    },
    {
      "personId": "others",
      "firstName": "Others",
      "lastName": "",
      "count": {
        "Closed": 43,
        "Verify": 1
      }
    }
  ],
  "resultDateTime": "2021-04-23T12:14:33.901"
}

const result = data.byPerson.reduce((result, {
  count
}) => {
  result.closed.push(count.Closed || 0);
  result.verify.push(count.Verify || 0);
  return result;
}, {
  closed: [],
  verify: []
});

console.log(result);

answered Apr 27, 2021 at 18:51

T J

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1 Comment

Aren Trot Over a year ago

Thanks. This is much better than my way.

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