How to Combine Two Objects with the Same Keys in JavaScript

A step-by-step guide on how to merge two JavaScript objects with identical keys, while preserving all values. Perfect for developers looking to enhance their object manipulation skills.
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How to Combine Two Objects with the Same Keys in JavaScript

In JavaScript, merging objects is a common task that developers often face. However, when you have two objects with the same keys but different values, you might run into issues where the values from the second object overwrite those from the first. In this guide, we'll explore how to effectively combine two such objects while keeping all their respective values intact.

The Problem

Let's consider an example where we have two objects with the same keys but varying values:

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The desired output, however, is to combine both arrays in each object:

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The Solution

To achieve this, we need to iterate through the keys of the objects and merge the values instead of replacing them. Let's break down the steps to do just that.

Step 1: Initialize an Empty Object

We start by creating an empty object that will hold our combined values.

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Step 2: Loop Through the Keys

Using a for...of loop, we can access each key in obj1:

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Here, we retrieve the values associated with the current key from both objects.

Step 3: Check if Values are Arrays

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In this line, we use the spread operator to combine the arrays from both objects.

Step 4: Log the Combined Object

Finally, you can log the combinedObj to view the result:

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This will display:

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Conclusion

In summary, merging two objects in JavaScript—where both share the same keys—requires a thoughtful approach to ensure all values are preserved. By iterating through the objects and merging their respective arrays, you can easily combine them to form a single cohesive object. This technique enhances your coding skills and equips you with efficient methods for handling similar challenges in the future.

Now that you know how to combine objects this way, you can confidently tackle similar situations in your own JavaScript projects!