Transform the array into an object containing corresponding key-value pairs

Question

Transform the array into an object containing corresponding key-value pairs

In my dataset, I have an array containing various values:

[
    {
      "factor": {
        "data": "f1",
        "val": [
          "val1"
        ]
      }
    },
    {
      "factor": {
        "data": "f2",
        "val": [
          "val2"
        ]
      }
    }
  ]

Is there a method to transform it into the format shown below?

{
    "keyvalue": {
        "factor": {
            "data": "f1",
            "val": ["val1"]
        },
        "factor": {
            "data": "f2",
            "val": ["val2"]
        }
    }
}

The standard process of converting arrays into objects doesn't apply in this situation since each key must be unique.

javascript arrays json object

Answer 1

Answer №1

It is not possible. Each key within an object must be unique. To illustrate this, consider having an object with two identical keys:

const newObj = {
  "key": 1,
  "key": 2
}

Now, if you were to access newObj.key, what value would you expect to get - 1 or 2? It simply does not make sense.

Perhaps you should reconsider the structure of your object. Have you considered using an array of objects instead?

{
  "keyvalue": {
    "factor": [
      {
        "data": "f1",
        "val": ["val1"]
      },
      {
        "data": "f2",
        "val": ["val2"]
      }
    ]
  }
}

Answer 2

It is not possible. Each key within an object must be unique. To illustrate this, consider having an object with two identical keys:

const newObj = {
  "key": 1,
  "key": 2
}

Now, if you were to access newObj.key, what value would you expect to get - 1 or 2? It simply does not make sense.

Perhaps you should reconsider the structure of your object. Have you considered using an array of objects instead?

{
  "keyvalue": {
    "factor": [
      {
        "data": "f1",
        "val": ["val1"]
      },
      {
        "data": "f2",
        "val": ["val2"]
      }
    ]
  }
}

Answer 3

Answer №2

If you want to create a key/value pair using the data field because it's always unique, you can follow this approach:

Consider the following structure:

{
    "factor": {
        "f1": ["val1"],
        "f2": ["val2"]
    }
}

To transform an array into a key/value object, you can do the following:

let keyValue = {"factor": {}};
theArray.forEach((item) => {
    const key = item.factor.data;
    const value = item.factor.val;
    keyValue.factor[key] = value;
});

After executing the code above, the keyValue object will be structured as described.

Answer 4

If you want to create a key/value pair using the data field because it's always unique, you can follow this approach:

Consider the following structure:

{
    "factor": {
        "f1": ["val1"],
        "f2": ["val2"]
    }
}

To transform an array into a key/value object, you can do the following:

let keyValue = {"factor": {}};
theArray.forEach((item) => {
    const key = item.factor.data;
    const value = item.factor.val;
    keyValue.factor[key] = value;
});

After executing the code above, the keyValue object will be structured as described.

Transform the array into an object containing corresponding key-value pairs

Answer №1

Answer №2

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