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

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