forming an instance from JSON information

In a .json file, I have data that includes information on countries such as their currency, major language, and land area in square kilometers or square miles.

{
    "countries": {
        "sweden": {
            "currency": "Swedish krona",
            "majorLanguage": "Swedish",
            "landArea": {               
                "value": 410330,
                "uom": "sq km"
                }           
            },
        "japan": {
            "currency": "yen",
            "majorLanguage": "Japanese",
            "landArea": {
                "value": 364500,
                "uom": "sq km"
                }           
            },
        "unitedStatesOfAmerica": {
            "currency": "US dollar",
            "majorLanguage": "English",
            "landArea": {
                "value": 3796742,
                "uom": "sq mi"
                }
            }
    }
}

I am looking for a way to dynamically create an object from this data structure that organizes the information by currency, major language, and land area for each country:

Object {
    "currency": Object {
    "japan": "yen",
    "sweden": "Swedish krona",
    "unitedStatesOfAmerica": "US dollar"
  },
  "majorLanguage": Object {
    "japan": "Japanese",
    "sweden": "Swedish",
    "unitedStatesOfAmerica": "English"
  },
  "landArea": Object {
    "japan": Object {
      "value": 364500,
      "uom": "sq km"
    },
    "sweden": Object {
      "value": 410330,
      "uom": "sq km"
    },
    "unitedStatesOfAmerica": Object {
      "value": 3796742,
      "uom": "sq mi"
    }
  }
}

The application consuming this data is built with Vue, so using JavaScript to achieve this objective is ideal. However, I aim to avoid relying on any third-party libraries. I am interested in a systematic approach that doesn't involve manually creating objects for currency, major language, and land area. I currently don't have a starting point for tackling this challenge and therefore do not have any initial code snippets to share.

javascriptjson

Answer №1

Not too complicated:

const finalResult = {};

for (const countryName in countries) {
    const currentCountry = countries[countryName];
    for (const propertyKey in currentCountry) {
        if (!finalResult[propertyKey]) finalResult[propertyKey] = {};
        finalResult[propertyKey][countryName] = currentCountry[propertyKey];
    }
}

Answer №2

If you are looking to utilize the Array#reduce method, you can implement a solution similar to the following example.

const data = {"countries":{"sweden":{"currency":"Swedish krona","majorLanguage":"Swedish","landArea":{"value":410330,"uom":"sq km"}},"japan":{"currency":"yen","majorLanguage":"Japanese","landArea":{"value":364500,"uom":"sq km"}},"unitedStatesOfAmerica":{"currency":"US dollar","majorLanguage":"English","landArea":{"value":3796742,"uom":"sq mi"}}}};
            // iterate over countries object key value pair
const res = Object.entries(data.countries).reduce((obj, [country, valObj]) => {
  // iterate over the country value key-val pair
  Object.entries(valObj).forEach(([key, val]) => {
    // define key if not defined
    obj[key] = obj[key] || {};
    // define the value within object where key is country
    obj[key][country] = val;
  })
  return obj;
}, {})

console.log(res);

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