Tips for changing an array of objects with identical key names?

Question

Tips for changing an array of objects with identical key names?

Here's an array of objects:

p =[
{
    "object1": "value",
},
{
    "object2": "value",
},
{
    "object1": "value",
},
{
    "object3": "value",
},
{
    "object4": "value",
},
{
    "object1": "value",
},
{
    "object3": "value"
}
];

I'm looking to adjust the keys of objects that share the same key. Any thoughts on how I can achieve this?

The desired output should be:

p =[
{
    "object1_1": "value",
},
{
    "object2": "value",
},
{
    "object1_2": "value",
},
{
    "object3_1": "value",
},
{
    "object4": "value",
},
{
    "object1_3": "value",
},
{
    "object3_2": "value",
}
];

The goal is to maintain the structure of the array as much as possible, with the only changes being updates to duplicate keys.

javascript arrays object

Answer 1

Answer №1

To determine the frequency of each key value, you can create a new object to keep track of how many times each key appears.

var tracker = {};

var updatedArray = originalArray.map(function(item){
    var key = Object.keys(item)[0];

    tracker[key] = (tracker[key] || 0) + 1;

    var name = key + '_' + tracker[key];
    
    var newObj = {};
    newObj[name] = item[key]; 
    return newObj;
});

NOTE:

It's advisable not to use "set" as the variable name. Also, consider removing the '_1' for the first occurrence by checking if statement like this:

var finalName;
if (tracker[key] === 1 ) { 
   finalName = key;
} else {
   finalName = key + '_' + tracker[key];
}

If you only want to add '_1' to repeating elements, you could iterate through the array once more using the final counts.

Answer 2

To determine the frequency of each key value, you can create a new object to keep track of how many times each key appears.

var tracker = {};

var updatedArray = originalArray.map(function(item){
    var key = Object.keys(item)[0];

    tracker[key] = (tracker[key] || 0) + 1;

    var name = key + '_' + tracker[key];
    
    var newObj = {};
    newObj[name] = item[key]; 
    return newObj;
});

NOTE:

It's advisable not to use "set" as the variable name. Also, consider removing the '_1' for the first occurrence by checking if statement like this:

var finalName;
if (tracker[key] === 1 ) { 
   finalName = key;
} else {
   finalName = key + '_' + tracker[key];
}

If you only want to add '_1' to repeating elements, you could iterate through the array once more using the final counts.

Answer 3

Answer №2

To tackle this problem, you will need to loop through the array twice. First, identify the keys that are repeated, and then replace their corresponding values in a second iteration.

var arr = [{
  "key1": "value",
}, {
  "key2": "value",
}, {
  "key1": "value",
}, {
  "key3": "value",
}, {
  "key4": "value",
}, {
  "key1": "value",
}, {
  "key3": "value",
}];

var keyCount = {};
var valueIndex = {};

function processKeys(callback) {
  for (var i = 0; i < arr.length; i++) {
    var obj = arr[i];
    var key = Object.keys(obj)[0];
    var countForKey = keyCount[key];
    callback(obj, key, countForKey);
  }
}

processKeys(function(obj, key, countForKey) {
  keyCount[key] = countForKey ? countForKey + 1 : 1;
  valueIndex[key] = 0;
});

processKeys(function(obj, key, countForKey) {
  if (countForKey !== 1) {
    var idx = valueIndex[key] + 1;
    valueIndex[key] = idx;
    obj[key + "_" + idx] = obj[key];
    delete obj[key];
  }
});

console.log(arr);

Execute the code snippet and review the console output for the updated result.

Answer 4

To tackle this problem, you will need to loop through the array twice. First, identify the keys that are repeated, and then replace their corresponding values in a second iteration.

var arr = [{
  "key1": "value",
}, {
  "key2": "value",
}, {
  "key1": "value",
}, {
  "key3": "value",
}, {
  "key4": "value",
}, {
  "key1": "value",
}, {
  "key3": "value",
}];

var keyCount = {};
var valueIndex = {};

function processKeys(callback) {
  for (var i = 0; i < arr.length; i++) {
    var obj = arr[i];
    var key = Object.keys(obj)[0];
    var countForKey = keyCount[key];
    callback(obj, key, countForKey);
  }
}

processKeys(function(obj, key, countForKey) {
  keyCount[key] = countForKey ? countForKey + 1 : 1;
  valueIndex[key] = 0;
});

processKeys(function(obj, key, countForKey) {
  if (countForKey !== 1) {
    var idx = valueIndex[key] + 1;
    valueIndex[key] = idx;
    obj[key + "_" + idx] = obj[key];
    delete obj[key];
  }
});

console.log(arr);

Execute the code snippet and review the console output for the updated result.

Tips for changing an array of objects with identical key names?

Answer №1

Answer №2

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