Tips for calculating the total count of a specific field within a JSON array with TypeScript

I have a JSON array.

 "user": {
            "value": [
                {

                    "customerNo": "1234"

                },
                {
                    "customerNo": "abcd"

                },
                {

                    "customerNo": "1234"

                }

            ]
        }

To find the total number of unique customers in the JSON array using TypeScript, you can do the following:

const uniqueCustomers = Array.from(new Set(json.user.value.map(item => item.customerNo))).length;
console.log(uniqueCustomers);

The output would be 2, as duplicate customer numbers are ignored.

jsontypescript

Answer №1

Utilize the power of lodash library:

var uniqueCustomer = _.uniqBy(json.user.value, 'customerNo');
var length = uniquеCustomer.length

Check out this link for a detailed explanation on How to integrate lodash into your application.

Answer №2

To tally up the number of distinct customers, you can utilize the Array.reduce method.

const data = { 
  "user": {
      "value": [
          {

              "customerNo": "1234"

          },
          {
              "customerNo": "abcd"

          },
          {

              "customerNo": "1234"

          }

      ]
  }
};

function getCustomerCount(arr) {
  let tmp = [];
  return arr.reduce((acc, curr) => {
    if(!tmp.includes(curr.customerNo)) {
      return tmp.push(curr.customerNo);
    }
    return acc;
  }, 0);
}

let customers = data.user.value;
let customerCount = getCustomerCount(customers);

console.log(customerCount);

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