How to add data in the below format?

January 12, 2023

I am stuck to add data in JS. I am not sure whether this could be done or not. I have tried but I failed to do so.

The below data needs to send to prepare in the API format.

0: { id2: 79, id3: 18}
1: { id2: 79, id3: 19}
2: { id2: 80, id3: 30}

I have to send the data to api in the below format.

For example: in APi format demands: id2 becomes key and id3 is value will be added to the same key and if there is new id2 then new key becomes and value will be added

"data1":{
"79":[18,19],
"80": [30],
}

>Solution :

let data = [  { id2: 79, id3: 18},  { id2: 79, id3: 19},  { id2: 80, id3: 30}];

let data1 = data.reduce((acc, current) => {
  if (!acc[current.id2]) {
    acc[current.id2] = []
  }
  acc[current.id2].push(current.id3)
  return acc
}, {})

console.log(data1)