Combining Objects from Two Arrays in JavaScript: Efficiently Merging Data by ID

Learn how to merge data from two arrays of objects in JavaScript by consolidating all items with matching IDs into a single object. This guide provides a straightforward solution and example code.
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Combining Objects from Two Arrays in JavaScript: Efficiently Merging Data by ID

In the world of programming, especially when dealing with JavaScript, you often find yourself needing to manipulate and combine arrays of objects. One common scenario is when you have two arrays, and you want to consolidate objects that share the same id into one unified structure. This guide will walk you through how to accomplish this task efficiently.

The Problem

Imagine you have two arrays:

arrayPrimary: Contains primary locations with their details.

arraySecondary: Contains additional details for some of those locations, but with some variations.

Here’s an example of the arrays:

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

The goal is to combine these two arrays into a single array:

After processing, the desired output should look like this:

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

The Solution

Here’s how you can achieve this result with JavaScript:

Step 1: Initialize the Resulting Array

First, we will transform the arrayPrimary to add an empty area array for each object:

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

Step 2: Populate the Area from arraySecondary

Next, we will iterate over the combined array and populate the area property of each object using the values found in the arraySecondary:

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

Full Code Example

Putting all this together, the complete code looks like this:

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

Conclusion

By using array mapping and filtering techniques, we can effectively consolidate information from two arrays of objects based on matching ids. This not only makes our data structure more organized but also allows for easier access and manipulation down the line.

Happy coding!