Convert array of objects inside in object into array of properties

Question

I have an Object which is having some properties like this:

obj1={
    "id": 2,
    "description": "",
    "operationIds": [
        {
            "id": 1,
            "name": "Standard"
        }
    ],
    "ratingIds": [
        {
            "id": 1,
            "name": "name1",
            "description": "",
        },
        {
            "id": 4,
            "name": "name4",
            "description": "",
        },
        {
            "id": 8,
            "name": "name8",
            "description": "",
        },
    ],
}

I want covert the array of objects (operationIds and ratingIds) inside the object to array of properties, I'm receiving this object and I want to apply the change on it and supply another method so it should look like this:

obj1={
    "id": 2,
    "description": "",
    "operationIds": [
        1
    ],
    "ratingIds": [
        1,
        4,
        8
    ],
    "timestamp": "AAAAAAAGJ6c=",
    "estimatedUtilReconciliationApplies": true
}

I was able to do it but in a verry ugly way, is there a more simple and clear way to accomplish this ?

let x = {...obj} as any;
let ar1 = x.operationIds;
const arr1= ar1.map(function (obj) {
  return obj.id;
});

let ar2 = x.ratingIds;
const arr2= ar2.map(function (obj) {
  return obj.id;
});

x.operatingEnvironmentIds = arr1;
x.thrustRatingIds = arr2;

forget about naming I'm just testing, but its long and I'm wondering if there is an easy and short solution for this. — Rabee Qabaha
– Rabee Qabaha, Commented Dec 7, 2022 at 16:59

JeanJacquesGourdin · Accepted Answer · 2022-12-07 16:59:07Z

You can use spread operator and map

let obj1={
    "id": 2,
    "description": "",
    "operationIds": [
        {
            "id": 1,
            "name": "Standard"
        }
    ],
    "ratingIds": [
        {
            "id": 1,
            "name": "name1",
            "description": "",
        },
        {
            "id": 4,
            "name": "name4",
            "description": "",
        },
        {
            "id": 8,
            "name": "name8",
            "description": "",
        },
    ],
}

console.log({
    ...obj1,
    operationIds:obj1.operationIds.map(elem => elem.id),
    ratingIds:obj1.ratingIds.map(elem => elem.id),
})

And as a function

let obj1={
    "id": 2,
    "description": "",
    "operationIds": [
        {
            "id": 1,
            "name": "Standard"
        }
    ],
    "ratingIds": [
        {
            "id": 1,
            "name": "name1",
            "description": "",
        },
        {
            "id": 4,
            "name": "name4",
            "description": "",
        },
        {
            "id": 8,
            "name": "name8",
            "description": "",
        },
    ],
}
let transform = (obj) => {
    return({
        ...obj,
        operationIds:obj.operationIds.map(elem => elem.id),
        ratingIds:obj.ratingIds.map(elem => elem.id),
    })
}
let transformed = transform(obj1)
console.log(transformed)

Mayank Gahlot · Accepted Answer · 2022-12-07 16:57:36Z

0

We loop the array and use the Object.assign() method to convert an array of objects to a single object. This merges each object into a single resultant object.

The Object.assign() method also merges the properties of one or more objects into a single object.

answered Dec 7, 2022 at 16:57

Mayank Gahlot

11 bronze badge

1 Comment

kellermat Over a year ago

Maybe you could make a concrete code example?

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