How to Merge an Array of Objects in JavaScript

Learn step-by-step how to effectively `merge arrays of objects` in JavaScript, combining static data with API responses efficiently.
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How to Merge an Array of Objects in JavaScript

When working with JavaScript, developers often encounter scenarios where they need to combine different data sets. A common use case is merging an array of static objects with data fetched from an API. For beginners, this can seem daunting, but it's quite manageable with the right approach. In this guide, we will explore how to effectively merge a constant array of objects with another array of objects received from an API response.

Understanding the Problem

Suppose you have a constant array of objects defined as follows:

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

You also receive an array of objects as a response from an API. Here's an example structure of that response:

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

Your goal is to merge the temp array into each object within the response_from_api array. The desired outcome would be that each object from the response_from_api now includes properties from the temp array.

Step-by-Step Solution

1. Understanding Object Spread Syntax

Before diving into the coding part, let's quickly review the object spread syntax. This syntax allows you to create a new object by combining properties from existing objects. For example:

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

In the above example, newObj will contain all properties from obj1 and obj2. This is what we will use to merge our arrays.

2. Implementing the Merge Functionality

You can use the map() function to iterate over each object in the response_from_api array and merge it with the temp object. Here's how the complete code would look:

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

3. Explanation of the Code

Define temp and API Response: We start by defining our constant temp object and the response received from the API as an array of objects.

Merging Objects: For each object res in response_from_api, we return a new object that contains all properties from res and temp using the spread syntax { ...res, ...temp }. This effectively combines the data from both sources.

Output the Result: Finally, we log the mergedArray to the console to see the result of our merge.

4. Example Output

Running the above code will produce an output similar to this:

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

Conclusion

By following the steps outlined above, merging a constant array of objects with an API response becomes a straightforward task. Just remember to leverage the power of the spread operator and map() for effective data manipulation. This technique can greatly streamline your data handling processes and make your code more efficient and readable.

Happy coding, and we hope this guide helps you in your JavaScript journey!