How To Merge Two Arrays Of Objects By Id Using Lodash Duplicate

Are you looking to combine or merge two arrays of objects based on their IDs but want to avoid duplicates? Well, you've come to the right place! In this article, we will walk you through a simple and effective method using Lodash, a popular JavaScript utility library, to achieve just that.

First things first, let's make sure you have Lodash set up in your project. If you haven't already done so, you can easily add Lodash to your project by running the following command in your terminal:

npm install lodash

Once you have Lodash installed, you can start utilizing its powerful functions. In this case, we will be focusing on merging two arrays of objects by their IDs without duplicating any entries.

Let's assume we have two arrays of objects, `array1` and `array2`, and we want to merge them based on a common ID field. Here's how you can achieve this using Lodash:

const _ = require('lodash');

const array1 = [
  { id: 1, name: 'Alice' },
  { id: 2, name: 'Bob' },
  { id: 3, name: 'Charlie' }
];

const array2 = [
  { id: 2, age: 30 },
  { id: 3, age: 25 },
  { id: 4, age: 40 }
];

const mergedArray = _.unionBy(array1, array2, 'id');

console.log(mergedArray);

In the code snippet above, we first import Lodash and define our two arrays of objects, `array1` and `array2`. We then use the `_.unionBy` function provided by Lodash, passing in the two arrays and the key ('id') by which we want to merge the objects.

The `_.unionBy` function combines the arrays, keeps unique elements based on the specified key ('id' in this case), and returns a new array with the merged objects without any duplicates.

By running this code, you should see the merged array printed to the console with the combined objects based on their IDs.

Using Lodash's `_.unionBy` function makes merging arrays of objects a breeze, especially when you need to maintain uniqueness based on a specific property like an ID.

So, next time you find yourself needing to merge two arrays of objects by ID and avoid duplicates, remember this handy Lodash function to streamline your workflow. Happy coding!