What is the optimal method for assigning a value to a specific key within a JavaScript JSON object?

Question

What is the optimal method for assigning a value to a specific key within a JavaScript JSON object?

Below is the information stored in a file called "fokontanys.json":

{
  "vzdveg643": {
    "lldistrict":"Ambilobe",
    "id_province": 7,
    "id": null
  },
  "vzvsdv5327": {
    "lldistrict":"Ambilobe",
    "id_province": 7,
    "id": null
  }
}

I am looking to replace the value of "null" for the "id" key with the respective object keys. I have successfully imported the json file:

let fokontanys = require("./fokontanys.json");

Within a foreach loop, I am making the necessary modifications:

Object.keys(fokontanys).forEach(function (fokontany) {    
  fokontanys[fokontany].ll_district=fokontanys[fokontany].lldistrict;
  fokontanys[fokontany].id="????????????????";
  delete fokontanys[fokontany].lldistrict;
  newFokontanys[fokontany] = fokontanys[fokontany];
});
console.log(newFokontanys);

Is there a method to extract the object keys and assign them as the id values? I have been struggling to find a solution for this. Any assistance would be greatly appreciated.

javascript arrays json object

Answer 1

Answer №1

By following your provided example, the placeholder "????????????????" can simply be substituted with fokontany, which is already an existing key in each object.

const fokontanys = {
  "vzdveg643": {
    "lldistrict":"Ambilobe",
    "id_province": 7,
    "id": null
  },
  "vzvsdv5327": {
    "lldistrict":"Ambilobe",
    "id_province": 7,
    "id": null
  }
}

const newFokontanys = {}

Object.keys(fokontanys).forEach(function (fokontany) { 
  fokontanys[fokontany].ll_district=fokontanys[fokontany].lldistrict;
  fokontanys[fokontany].id=fokontany;
  delete fokontanys[fokontany].lldistrict;
  newFokontanys[fokontany] = fokontanys[fokontany];
});

console.log(newFokontanys);

Answer 2

By following your provided example, the placeholder "????????????????" can simply be substituted with fokontany, which is already an existing key in each object.

const fokontanys = {
  "vzdveg643": {
    "lldistrict":"Ambilobe",
    "id_province": 7,
    "id": null
  },
  "vzvsdv5327": {
    "lldistrict":"Ambilobe",
    "id_province": 7,
    "id": null
  }
}

const newFokontanys = {}

Object.keys(fokontanys).forEach(function (fokontany) { 
  fokontanys[fokontany].ll_district=fokontanys[fokontany].lldistrict;
  fokontanys[fokontany].id=fokontany;
  delete fokontanys[fokontany].lldistrict;
  newFokontanys[fokontany] = fokontanys[fokontany];
});

console.log(newFokontanys);

Answer 3

Answer №2

Combine Object.fromEntries, Object.entries, and map into a single line for efficient data processing

const result = (data) =>
  Object.fromEntries(
    Object.entries(data).map(([key, obj]) => [key, { ...obj, id: key }])
  );

const input = {
  vzdveg643: {
    lldistrict: "Ambilobe",
    id_province: 7,
    id: null,
  },
  vzvsdv5327: {
    lldistrict: "Ambilobe",
    id_province: 7,
    id: null,
  },
};

console.log(result(input))

Answer 4

Combine Object.fromEntries, Object.entries, and map into a single line for efficient data processing

const result = (data) =>
  Object.fromEntries(
    Object.entries(data).map(([key, obj]) => [key, { ...obj, id: key }])
  );

const input = {
  vzdveg643: {
    lldistrict: "Ambilobe",
    id_province: 7,
    id: null,
  },
  vzvsdv5327: {
    lldistrict: "Ambilobe",
    id_province: 7,
    id: null,
  },
};

console.log(result(input))

What is the optimal method for assigning a value to a specific key within a JavaScript JSON object?

Answer №1

Answer №2

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