How to Merge Arrays of Objects in JavaScript Based on Unique Keys

Learn how to efficiently combine multiple arrays of objects in JavaScript using unique keys for a comprehensive result.
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How to Merge Arrays of Objects in JavaScript Based on Unique Keys

Working with arrays of objects is a common task in JavaScript, especially when handling data from different sources or APIs. If you have multiple arrays and need to combine them based on a unique identifier, such as a MAC address for devices, you are in the right place. In this guide, we'll walk you through a practical example of merging arrays of objects based on a unique key, specifically focusing on how to consolidate data accurately using JavaScript.

Understanding the Problem

Imagine you have the following arrays of device data:

Devices - Contains device information along with a total count.

CompletedArray - Contains data about completed tasks for each device.

IncompletedArray - Contains data about incomplete tasks for each device.

To get a comprehensive view of each device's data, we need to merge these arrays based on the unique Device_MAC key. The expected result will be a unified array that combines all relevant data into one object for each device.

Sample Data

Here’s the sample data we’ll be working with:

[[See Video to Reveal this Text or Code Snippet]]

The desired result should look like this:

[[See Video to Reveal this Text or Code Snippet]]

Step-by-Step Solution

To achieve this merging, we can utilize a function that dynamically combines our arrays using the unique Device_MAC key. Below, I'll break down the merging process into clear sections.

1. Define the Merging Function

We'll create a function called merge that takes an arbitrary number of arrays as arguments. This function will iterate through each array and combine the contents into a single object based on the Device_MAC key.

[[See Video to Reveal this Text or Code Snippet]]

2. Test the Function

Now we can test our merge function with the provided arrays. Simply call the merge function with Devices, CompletedArray, and IncompletedArray as arguments.

[[See Video to Reveal this Text or Code Snippet]]

3. Understanding the Output

When you run the code above, the console will display the merged array containing each device’s records consolidated into single objects. Each device will have all relevant fields correctly populated based on the unique Device_MAC key.

Final Thoughts

Merging arrays of objects can seem tricky at first, particularly when dealing with unique keys or varying structures. However, with the method outlined above, you can effectively combine any number of arrays based on a shared identifier in JavaScript. This technique is particularly useful in applications that require strong data management capabilities.

If you have any questions or additional scenarios you'd like us to cover, feel free to leave your thoughts in the comments below! Happy coding!