Combining two arrays of objects using JavaScript

Question

Combining two arrays of objects using JavaScript

I am working with two arrays of objects that look like this:

objects [ { countMedias: 2 },
  { countMedias: 1 },
  { countMedias: 3 },
  { countMedias: 1 },
  { countMedias: 2 } ]
listePlayliste [ { nom_playlist: 'bbbb' },
  { nom_playlist: 'ccc' },
  { nom_playlist: 'aaaa' },
  { nom_playlist: 'xxxx' },
  { nom_playlist: 'resttttttttt' } ]

My goal is to merge both arrays to create a new array structured as follows:

Result [ { nom_playlist: 'bbbb', countMedias: 2 },
  { nom_playlist: 'ccc', countMedias: 1  },
  { nom_playlist: 'aaaa', countMedias: 3 },
  { nom_playlist: 'xxxx', countMedias: 1 },
  { nom_playlist: 'resttttttttt', countMedias: 2 } ]

I attempted the following approach, but it did not yield the desired result:

Array.prototype.push.apply(json,objects);

javascript arrays json object merge

Answer 1

Answer №1

Consider trying the following code snippet:

objects.map((object, index) => Object.assign(object, listePlayliste[index]))

This method may be effective for small arrays, but avoid using it on larger ones as it could lead to decreased performance.

Answer 2

Consider trying the following code snippet:

objects.map((object, index) => Object.assign(object, listePlayliste[index]))

This method may be effective for small arrays, but avoid using it on larger ones as it could lead to decreased performance.

Answer 3

Answer №2

Try using the map method to iterate over one array and return an object that combines elements from two arrays based on their index.

const objects = [{
    countMedias: 2
  },
  {
    countMedias: 1
  },
  {
    countMedias: 3
  },
  {
    countMedias: 1
  },
  {
    countMedias: 2
  }
];

const listePlayliste = [{
    nom_playlist: 'bbbb'
  },
  {
    nom_playlist: 'ccc'
  },
  {
    nom_playlist: 'aaaa'
  },
  {
    nom_playlist: 'xxxx'
  },
  {
    nom_playlist: 'resttttttttt'
  }
];

const output = objects.map((obj, i) => ({
  ...obj,
  ...listePlayliste[i]
}));
console.log(output);

Answer 4

Try using the map method to iterate over one array and return an object that combines elements from two arrays based on their index.

const objects = [{
    countMedias: 2
  },
  {
    countMedias: 1
  },
  {
    countMedias: 3
  },
  {
    countMedias: 1
  },
  {
    countMedias: 2
  }
];

const listePlayliste = [{
    nom_playlist: 'bbbb'
  },
  {
    nom_playlist: 'ccc'
  },
  {
    nom_playlist: 'aaaa'
  },
  {
    nom_playlist: 'xxxx'
  },
  {
    nom_playlist: 'resttttttttt'
  }
];

const output = objects.map((obj, i) => ({
  ...obj,
  ...listePlayliste[i]
}));
console.log(output);

Answer 5

Answer №3

When working with arrays, the Object.assign() method can be used to merge objects similar to objects.map(). However, it should be noted that Object.assign() will modify the original array. Refer to the code snippet below:

objects = [ { countMedias: 2 },
  { countMedias: 1 },
  { countMedias: 3 },
  { countMedias: 1 },
  { countMedias: 2 } ];
listePlayliste = [ { nom_playlist: 'bbbb' },
  { nom_playlist: 'ccc' },
  { nom_playlist: 'aaaa' },
  { nom_playlist: 'xxxx' },
  { nom_playlist: 'resttttttttt' } ];


for (let i=0; i<objects.length; i++) {
  Object.assign(objects[i], listePlayliste[i]);
}

console.log(objects);

If you want to avoid modifying the original array, consider using Spread syntax instead. See the code snippet below for an alternative approach:

objects = [ { countMedias: 2 },
  { countMedias: 1 },
  { countMedias: 3 },
  { countMedias: 1 },
  { countMedias: 2 } ];
listePlayliste = [ { nom_playlist: 'bbbb' },
  { nom_playlist: 'ccc' },
  { nom_playlist: 'aaaa' },
  { nom_playlist: 'xxxx' },
  { nom_playlist: 'resttttttttt' } ];

var result = [];
for (let i=0; i<objects.length; i++) {
  result.push({ ...objects[i], ...listePlayliste[i] })
}

console.log(result);
console.log(objects);

Answer 6

When working with arrays, the Object.assign() method can be used to merge objects similar to objects.map(). However, it should be noted that Object.assign() will modify the original array. Refer to the code snippet below:

objects = [ { countMedias: 2 },
  { countMedias: 1 },
  { countMedias: 3 },
  { countMedias: 1 },
  { countMedias: 2 } ];
listePlayliste = [ { nom_playlist: 'bbbb' },
  { nom_playlist: 'ccc' },
  { nom_playlist: 'aaaa' },
  { nom_playlist: 'xxxx' },
  { nom_playlist: 'resttttttttt' } ];


for (let i=0; i<objects.length; i++) {
  Object.assign(objects[i], listePlayliste[i]);
}

console.log(objects);

If you want to avoid modifying the original array, consider using Spread syntax instead. See the code snippet below for an alternative approach:

objects = [ { countMedias: 2 },
  { countMedias: 1 },
  { countMedias: 3 },
  { countMedias: 1 },
  { countMedias: 2 } ];
listePlayliste = [ { nom_playlist: 'bbbb' },
  { nom_playlist: 'ccc' },
  { nom_playlist: 'aaaa' },
  { nom_playlist: 'xxxx' },
  { nom_playlist: 'resttttttttt' } ];

var result = [];
for (let i=0; i<objects.length; i++) {
  result.push({ ...objects[i], ...listePlayliste[i] })
}

console.log(result);
console.log(objects);

Combining two arrays of objects using JavaScript

Answer №1

Answer №2

Answer №3

Similar questions

Utilize parent function employing component

Convert the PHP variable into a JSON object

Adding Node Modules during the setup of an ElectronJS application

I possess an array with a specific structure that I wish to substitute the keys as demonstrated below

"Transmitting data via HTTP POST on an Android device

Having difficulty locating the index of the column labeled `Clients` within a table; the result being -1

Timing problem with the getJSON function in jQuery

Is it possible to dynamically change the port for an Express server?

Is there a way to trigger an interact.js event that will reset all draggables back to their original position at coordinates (0, 0)?

Instructions for including packages in .vue files

Transferring data from local storage to a PHP server using AJAX

increasing the size of the input thumb compared to the others

Azure webhosting blocks the use of AJAX calls

Retrieve JSON data and use a button to sort and display markers on a Google Map

`vuetify sidebar with a nested menu``

Connect to Node-Red websocket server

Identifying the user's location within the application and dynamically loading various Angular scripts

Having trouble authenticating the CSRF token! Using RAILS API and sending a POST request

Passing events between sibling components in Angular 2Incorporating event emission in

Adjust an OnDemandGrid utilizing dstore/Rest output through a POST request instead of a PUT request