Tips for converting a JavaScript object into a key/value array

Question

Tips for converting a JavaScript object into a key/value array

How can I transform a JavaScript object into an array of objects, each containing a key and value pair?

For example:

var data = { firstName: 'John', lastName: 'Doe', email: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="86ece9eee8a8e2e9e3c6e1ebe7efeaa8e5e9eb">[email protected]</a>' }

The desired output would look like this:

[
      { key: 'firstName', value: 'John' },
      { key: 'lastName', value: 'Doe' },
      { key: 'email', value: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="53393c3b3d7d373c3613343e323a3f7d303c3e">[email protected]</a>' }
    ]

javascript arrays javascript-objects

Answer 1

Answer №1

const userProfile = { name: 'Alice', surname: 'Smith', email: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="355e5b5c5ab05a515b41565759515d5550125f5351">[email protected]</a>' }
const profileEntries = Object.entries(userProfile).map(([key, value]) => ({ key, value }));

console.log(profileEntries);

Found this helpful link

Answer 2

const userProfile = { name: 'Alice', surname: 'Smith', email: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="355e5b5c5ab05a515b41565759515d5550125f5351">[email protected]</a>' }
const profileEntries = Object.entries(userProfile).map(([key, value]) => ({ key, value }));

console.log(profileEntries);

Found this helpful link

Answer 3

Answer №2

Utilizing the map method for processing data

var information = { firstName: 'Jane', lastName: 'Smith', email: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="b5dfdafedc9aed3d2ffccfaededabcd88cdff">[email protected]</a>' };

var output = Object.keys(information).map(item => ({ property: item, info: information[item] }));

console.log(output);

Answer 4

Utilizing the map method for processing data

var information = { firstName: 'Jane', lastName: 'Smith', email: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="b5dfdafedc9aed3d2ffccfaededabcd88cdff">[email protected]</a>' };

var output = Object.keys(information).map(item => ({ property: item, info: information[item] }));

console.log(output);

Answer 5

Answer №3

One way to approach this is by looping through the properties of the object and creating a new object for each property.

var data = { firstName: 'Jane', lastName: 'Smith', email: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9bf1f4f3f5b5fff4fedbfcfc6cbfebbc8c4d6">[email protected]</a>' };
var result = [];

for(var property in data)
{
    if(data.hasOwnProperty(property))
    {
        result.push({
            key: property,
            value: data[property]
        });
    }
}

Answer 6

One way to approach this is by looping through the properties of the object and creating a new object for each property.

var data = { firstName: 'Jane', lastName: 'Smith', email: '<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="9bf1f4f3f5b5fff4fedbfcfc6cbfebbc8c4d6">[email protected]</a>' };
var result = [];

for(var property in data)
{
    if(data.hasOwnProperty(property))
    {
        result.push({
            key: property,
            value: data[property]
        });
    }
}

Answer 7

Answer №4

After reading the previous response, a more efficient solution came to mind...

Transforming the data object into an array of key-value pairs can be done using the map method in JavaScript.
Object.keys(data).map(function(key) {
  return { key, value: data[key] };
});

An alternative approach is to use ES6 arrow functions:

By utilizing arrow functions in ES6, we can simplify the code even further:
Object.keys(data).map((key) => ({ key, value: data[key] }));

Answer 8

After reading the previous response, a more efficient solution came to mind...

Transforming the data object into an array of key-value pairs can be done using the map method in JavaScript.
Object.keys(data).map(function(key) {
  return { key, value: data[key] };
});

An alternative approach is to use ES6 arrow functions:

By utilizing arrow functions in ES6, we can simplify the code even further:
Object.keys(data).map((key) => ({ key, value: data[key] }));

Answer 9

Answer №5

Simplify your life by utilizing ES6 syntax along with the map function.

    let result = Object.keys(data).map(key => {
      return {
        key: key,
        value: data[key]
      };
    })

Answer 10

Simplify your life by utilizing ES6 syntax along with the map function.

    let result = Object.keys(data).map(key => {
      return {
        key: key,
        value: data[key]
      };
    })

Answer 11

Answer №6

<pre>let resultsArray = [];
for(let key in data) {
    resultsArray.push({key: key, value: data[key]});
}
</pre>

Answer 12

<pre>let resultsArray = [];
for(let key in data) {
    resultsArray.push({key: key, value: data[key]});
}
</pre>

Answer 13

Answer №7

Explore new possibilities by allowing users to customize the key and value keys:

module.exports = function transformObjectToArray(obj, customKey = 'key', customValue = 'value') {
    return Object
        .keys(obj)
        .filter(key => Object.prototype.hasOwnProperty.call(obj, key))
        .map(key => {
            const keyValueArray = {};
            keyValueArray[customKey] = key;
            keyValueArray[customValue] = obj[key];

            return keyValueArray;
        });
};

Answer 14

Explore new possibilities by allowing users to customize the key and value keys:

module.exports = function transformObjectToArray(obj, customKey = 'key', customValue = 'value') {
    return Object
        .keys(obj)
        .filter(key => Object.prototype.hasOwnProperty.call(obj, key))
        .map(key => {
            const keyValueArray = {};
            keyValueArray[customKey] = key;
            keyValueArray[customValue] = obj[key];

            return keyValueArray;
        });
};

Answer 15

Answer №8

A different approach to achieve this that is capable of handling multi-level objects without the need for recursion.

var result = []

    var obj = {
      x: 0,
      y: 1,
      z: {
        x0: {
          x1: 4,
          y1: 5,
          z1: 6
        },
        y0: 2,
        z0: [0, 1, 2],
      }
    }

    var stack = [[obj,[ '_root_' ]]]
    var newStack = []


    while(stack.length){

    var currentObj = stack.pop()

    var rootPath = currentObj[1]
        currentObj = currentObj[0]


      for(var prop in currentObj ){

        var currPath = rootPath.slice()
            currPath.push(prop)

        switch( currentObj[prop].toString() ){
        case '[object Object]':
          newStack.push( [ currentObj[prop], currPath ] )
        break;;
        default:
         result.push({
          path  : currPath ,
          value : currentObj[prop]
         })
        break;;
        }
      }

      if(!stack.length)
          stack = newStack.splice(0,newStack.length)
    }

[
{ path: [ '_root_', 'x' ], value: 0 },
{ path: [ '_root_', 'y' ], value: 1 },
{ path: [ '_root_', 'z', 'y0' ], value: 2 },
{ path: [ '_root_', 'z', 'z0' ], value: [ 0, 1, 2 ] },
{ path: [ '_root_', 'z', 'x0', 'x1' ], value: 4 },
{ path: [ '_root_', 'z', 'x0', 'y1' ], value: 5 },
{ path: [ '_root_', 'z', 'x0', 'z1' ], value: 6 }
]

Answer 16

A different approach to achieve this that is capable of handling multi-level objects without the need for recursion.

var result = []

    var obj = {
      x: 0,
      y: 1,
      z: {
        x0: {
          x1: 4,
          y1: 5,
          z1: 6
        },
        y0: 2,
        z0: [0, 1, 2],
      }
    }

    var stack = [[obj,[ '_root_' ]]]
    var newStack = []


    while(stack.length){

    var currentObj = stack.pop()

    var rootPath = currentObj[1]
        currentObj = currentObj[0]


      for(var prop in currentObj ){

        var currPath = rootPath.slice()
            currPath.push(prop)

        switch( currentObj[prop].toString() ){
        case '[object Object]':
          newStack.push( [ currentObj[prop], currPath ] )
        break;;
        default:
         result.push({
          path  : currPath ,
          value : currentObj[prop]
         })
        break;;
        }
      }

      if(!stack.length)
          stack = newStack.splice(0,newStack.length)
    }

[
{ path: [ '_root_', 'x' ], value: 0 },
{ path: [ '_root_', 'y' ], value: 1 },
{ path: [ '_root_', 'z', 'y0' ], value: 2 },
{ path: [ '_root_', 'z', 'z0' ], value: [ 0, 1, 2 ] },
{ path: [ '_root_', 'z', 'x0', 'x1' ], value: 4 },
{ path: [ '_root_', 'z', 'x0', 'y1' ], value: 5 },
{ path: [ '_root_', 'z', 'x0', 'z1' ], value: 6 }
]

Answer 17

Answer №9

let items = [
    { name: "apple", color: "red" },
    { name: "banana", color: "yellow" },
];

let itemObj = Object.fromEntries(items.map(item => [item.name, item.color]));

console.log(itemObj);

Answer 18

let items = [
    { name: "apple", color: "red" },
    { name: "banana", color: "yellow" },
];

let itemObj = Object.fromEntries(items.map(item => [item.name, item.color]));

console.log(itemObj);

Answer 19

Answer №10

If you're dealing with nested objects and arrays, I highly recommend using the npm package called flat. It's incredibly efficient for flattening data structures.

const flatten = require('flat')

flatten({
    apple: {
        red: 'fruit'
    },
    banana: {
        yellow: 'fruit'
    },
    carrot: { a: { b: { c: 3 } } }
})

// {
//   'apple.red': 'fruit',
//   'banana.yellow': 'fruit',
//   'carrot.a.b.c': 3
// }

Answer 20

If you're dealing with nested objects and arrays, I highly recommend using the npm package called flat. It's incredibly efficient for flattening data structures.

const flatten = require('flat')

flatten({
    apple: {
        red: 'fruit'
    },
    banana: {
        yellow: 'fruit'
    },
    carrot: { a: { b: { c: 3 } } }
})

// {
//   'apple.red': 'fruit',
//   'banana.yellow': 'fruit',
//   'carrot.a.b.c': 3
// }

Answer 21

Answer №11

let data = [
    { id: "id1", title: "title1" },
    { id: "id2", title: "title2" },
];

let result = Object.assign({}, ...data.map(entry => ({[entry.id]: entry.title})));

console.log(result);

Answer 22

let data = [
    { id: "id1", title: "title1" },
    { id: "id2", title: "title2" },
];

let result = Object.assign({}, ...data.map(entry => ({[entry.id]: entry.title})));

console.log(result);

Tips for converting a JavaScript object into a key/value array

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Answer №6

Answer №7

Answer №8

Answer №9

Answer №10

Answer №11

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