How to push data into an same object based on specific key in typescript

Question

I have an jason result as below and I want to read from it and push to specific key as below JSON result

[
{id:1,Name:"test",billNumber:"123"}
{id:2,Name:"test1",billNumber:"123"}
{id:3,Name:"test2",billNumber:"12345"}
{id:2,Name:"test3",billNumber:"12345"}
{id:3,Name:"test4",billNumber:"12334535"}
]

I want to have array list as below

{
"123":[{id:1,Name:"test",billNumber:"123"}, {id:2,Name:"test1",billNumber:"123"}],
"12345":[ {id:3,Name:"test2",billNumber:"12345"},{id:2,Name:"test3",billNumber:"12345"}],
"12334535":[{id:3,Name:"test4",billNumber:"12334535"}]
}

How to get the above list from the json result. Please do help

Terry · Accepted Answer · 2020-09-04 13:58:39Z

You don't need lodash to do that: just a regular Array.prototype.reduce will do the work. At each iteration, you simply check if the billNumber of the current item is in the object:

if it is not (i.e. a new entry), then you assign an array with a single element
if it is (i.e. the billNumber has been encountered before), then you simply push into the array

See proof-of-concept below:

const data = [{
  id: 1,
  Name: "test",
  billNumber: "123"
}, {
  id: 2,
  Name: "test1",
  billNumber: "123"
}, {
  id: 3,
  Name: "test2",
  billNumber: "12345"
}, {
  id: 2,
  Name: "test3",
  billNumber: "12345"
}, {
  id: 3,
  Name: "test4",
  billNumber: "12334535"
}];

const transformedData = data.reduce((acc, cur) => {
  if (cur.billNumber in acc) {
    acc[cur.billNumber].push(cur);
  } else {
    acc[cur.billNumber] = [cur];
  }

  return acc;
}, {});
console.log(transformedData);

Nicoowr · Accepted Answer · 2020-09-04 13:47:45Z

1

Use groupBy from lodash: const result = groupBy(input, "billNumber") (input is your array)

answered Sep 4, 2020 at 13:47

Nicoowr

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Comments

toyseed · Accepted Answer · 2020-09-04 13:59:19Z

1

you can use reduce method.

[
{id:1,Name:"test",billNumber:"123"},
{id:2,Name:"test1",billNumber:"123"},
{id:3,Name:"test2",billNumber:"12345"},
{id:2,Name:"test3",billNumber:"12345"},
{id:3,Name:"test4",billNumber:"12334535"},
].reduce((acc, value) => {
    if (!acc[value.billNumber]) {
        acc[value.billNumber] = [];
    }
    
    acc[value.billNumber].push(value);
    return acc;
}, {})

answered Sep 4, 2020 at 13:59

toyseed

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Comments

M Muzzammil ijaz · Accepted Answer · 2020-09-04 13:59:45Z

-1

Here is the mimic code You cann use and get help

var a = [{a:2},{a:3},{a:4}]

let b = {}
let c = 1
a.forEach(obj => {
  b[c] = [obj]
  c++
})

output will be

{ 
  1: [ { a: 2 } ],
  2: [ { a: 3 } ], 
  3: [ { a: 4 } ] 
}

Thanks I hope it will help !

answered Sep 4, 2020 at 13:59

M Muzzammil ijaz

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