Discovering the frequency of a specific key in a JSON object or array using JavaScript

Suppose I have a JSON object with the given data, how can I determine the frequency of the key: "StateID"?

[{"StateID":"42","State_name":"Badakhshan","CountryID":"1"},
{"StateID":"43","State_name":"Badgis","CountryID":"1"},
{"StateID":"44","State_name":"Baglan","CountryID":"1"},
{"StateID":"45","State_name":"Balkh","CountryID":"1"},
{"StateID":"46","State_name":"Bamiyan","CountryID":"1"},
{"StateID":"47","State_name":"Farah","CountryID":"1"},
{"StateID":"48","State_name":"Faryab","CountryID":"1"},
{"StateID":"49","State_name":"Gawr","CountryID":"1"},
{"StateID":"50","State_name":"Gazni","CountryID":"1"},
{"StateID":"51","State_name":"Herat","CountryID":"1"},
{"StateID":"52","State_name":"Hilmand","CountryID":"1"},
{"StateID":"53","State_name":"Jawzjan","CountryID":"1"},
{"StateID":"54","State_name":"Kabul","CountryID":"1"},
{"StateID":"55","State_name":"Kapisa","CountryID":"1"},
{"StateID":"56","State_name":"Khawst","CountryID":"1"},
{"StateID":"57","State_name":"Kunar","CountryID":"1"},
{"StateID":"58","State_name":"Lagman","CountryID":"1"},
{"StateID":"59","State_name":"Lawghar","CountryID":"1"},
{"StateID":"60","State_name":"Nangarhar","CountryID":"1"},
{"StateID":"61","State_name":"Nimruz","CountryID":"1"},
{"StateID":"62","State_name":"Nuristan","CountryID":"1"},
{"StateID":"63","State_name":"Paktika","CountryID":"1"},
{"StateID":"64","State_name":"Paktiya","CountryID":"1"},
{"StateID":"65","State_name":"Parwan","CountryID":"1"},
{"StateID":"66","State_name":"Qandahar","CountryID":"1"},
{"StateID":"67","State_name":"Qunduz","CountryID":"1"},
{"StateID":"68","State_name":"Samangan","CountryID":"1"},
{"StateID":"69","State_name":"Sar-e Pul","CountryID":"1"},
{"StateID":"70","State_name":"Takhar","CountryID":"1"},
{"StateID":"71","State_name":"Uruzgan","CountryID":"1"},
{"StateID":"72","State_name":"Wardag","CountryID":"1"},
{"StateID":"73","State_name":"Zabul","CountryID":"1"}]
javascriptjson

Answer №1

If you want to achieve that, you can follow these steps:

let states = [{"StateID":"42","State_name":"Badakhshan","CountryID":"1"},{"StateID":"43","State_name":"Badgis","CountryID":"1"},{"StateID":"44","State_name":"Baglan","CountryID":"1"},{"StateID":"45","State_name":"Balkh","CountryID":"1"},{"StateID":"46","State_name":"Bamiyan","CountryID":"1"},{"StateID":"47","State_name":"Farah","CountryID":"1"},{"StateID":"48","State_name":"Faryab","CountryID":"1"},{"StateID":"49","State_name":"Gawr","CountryID":"1"},{"StateID":"50","State_name":"Gazni","CountryID":"1"},{"StateID":"51","State_name":"Herat","CountryID":"1"},{"StateID":"52","State_name":"Hilmand","CountryID":"1"},{"StateID":"53","State_name":"Jawzjan","CountryID":"1"},{"StateID":"54","State_name":"Kabul","CountryID":"1"},{"StateID":"55","State_name":"Kapisa","CountryID":"1"},{"StateID":"56","State_name":"Khawst","CountryID":"1"},{"StateID":"57","State_name":"Kunar","CountryID":"1"},{"StateID":"58","State_name":"Lagman","CountryID":"1"},{"StateID":"59","State_name":"Lawghar","CountryID":"1"},{"StateID":"60","State_name":"Nangarhar","CountryID":"1"},{"StateID":"61","State_name":"Nimruz","CountryID":"1"},{"StateID":"62","State_name":"Nuristan","CountryID":"1"},{"StateID":"63","State_name":"Paktika","CountryID":"1"},{"StateID":"64","State_name":"Paktiya","CountryID":"1"},{"StateID":"65","State_name":"Parwan","CountryID":"1"},{"StateID":"66","State_name":"Qandahar","CountryID":"1"},{"StateID":"67","State_name":"Qunduz","CountryID":"1"},{"StateID":"68","State_name":"Samangan","CountryID":"1"},{"StateID":"69","State_name":"Sar-e Pul","CountryID":"1"},{"StateID":"70","State_name":"Takhar","CountryID":"1"},{"StateID":"71","State_name":"Uruzgan","CountryID":"1"},{"StateID":"72","State_name":"Wardag","CountryID":"1"},{"StateID":"73","State_name":"Zabul","CountryID":"1"}]

let stateCount = states.reduce((countMap, state) => {
    countMap[state.StateID] = countMap[state.StateID] || 0;
    countMap[state.StateID]++;
    return countMap;
}, {});

console.log(stateCount);

Answer №2

To find the number of objects in an array that contain a specific property, you can utilize the filter method and return the count.

const
  data = [ {"StateID":"42","State_name":"Badakhshan","CountryID":"1"}, {"StateID":"43","State_name":"Badgis","CountryID":"1"}, {"StateID":"44","State_name":"Baglan","CountryID":"1"}, {"StateID":"45","State_name":"Balkh","CountryID":"1"}, {"StateID":"46","State_name":"Bamiyan","CountryID":"1"}, {"StateID":"47","State_name":"Farah","CountryID":"1"}, {"StateID":"48","State_name":"Faryab","CountryID":"1"}, {"StateID":"49","State_name":"Gawr","CountryID":"1"}, {"StateID":"50","State_name":"Gazni","CountryID":"1"}, {"StateID":"51...

/**
 * Determine how many items in the array have a specific property.
 *
 * @param {Array} dataset        The array to examine for the presence of 
 *                               the specified property.
 * @param {String} keyName       The name of the property to look for in 
 *                               the objects within the array.
 *
 * @returns {Number} The function returns the count of objects in the array 
 *                   containing the specified property.
 */
function calculateProperty(dataArr, keyName) {
  const
    targetItems = dataArr.filter(item => item[keyName] !== undefined);
    
  return targetItems.length;
}

console.log(`Count of "StateID" occurrences: ${calculateProperty(data, 'StateID')}`);

Answer №3

let count = 0;
for (let index=0; index < array.length; index++) {
if (array[index].stateId) {
count++;
}
}
console.log("number of items with stateId:", count);

Answer №4

Here's a potential example:

const myData = [your data];
console.log('Total count:', myData.filter(function(item){ return Object.keys(item).includes('StateID'); }).length);

Answer №5

There are several ways to achieve this goal, so feel free to explore other answers for alternative solutions.

This particular method uses an Array.prototype.forEach loop to check if the StateID is present and greater than 0.

data = [{"StateID":"42","State_name":"Badakhshan","CountryID":"1"},
{"StateID":"43","State_name":"Badgis","CountryID":"1"},
{"StateID":"44","State_name":"Baglan","CountryID":"1"},
// Additional state data goes here
{"StateID":"73","State_name":"Zabul","CountryID":"1"}];

var count = 0;
data.forEach(function(entry){
    entry.StateID > 0 ? count++ : null;
});
console.log(count);

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