How to Create a New Array of Objects from Two Arrays in Vanilla JavaScript

Discover how to effectively merge two arrays of objects in JavaScript, printing the results with ease. Learn step-by-step methods to overcome common challenges!
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Merging Two Arrays of Objects in Vanilla JavaScript

In the realm of JavaScript programming, one common challenge developers face is merging two arrays of objects based on shared properties. This scenario often arises when you need to bring together data from different sources into a single, cohesive format. Today, we’re going to explore how to achieve this with a specific example involving watches and their respective colors.

The Problem

Imagine you have two arrays, one containing details about various watches and the other containing the associated colors of these watches. Here’s what they look like:

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

You want to print the name of each watch alongside its color, like so:

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

The Solution

To accomplish this, you’ll need to loop through the watches array, find the matching color in the watch_colors array, and print the desired output. Let's break this down step by step.

Step-by-Step Breakdown

Loop through the Watches: Use the forEach() method to iterate over the watches array.

Find the Corresponding Color: For each watch, use the find() method to locate the matching color from watch_colors where the color ID matches the watch's color.

Log the Result: If a match is found, log the watch label and its corresponding color.

Here's the Complete Code

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

How It Works

forEach(): This method iterrates over each element in the watches array. For each watch, we execute the provided function.

find(): This method checks if there exists a color object in the watch_colors array where the ID matches the watch's color attribute.

Template Literals: We use template literals (`${variable}`) to easily format our output string.

The if(color) check ensures that we only attempt to log information when a matching color is found, preventing any potential errors.

Final Output

When you run the above code, you will see the following output in your console:

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

Conclusion

Merging arrays of objects in JavaScript might seem daunting at first, but it becomes straightforward with a systematic approach. By using forEach() and find(), you can efficiently connect related data from different sources. This method not only organizes your data neatly but also maintains maintainable code that's easy to read and understand.

Whether you're working on data visualization, reporting, or any task requiring object manipulation in JavaScript, mastering these techniques will undoubtedly enhance your programming toolkit.

Now, why not try implementing this in your own projects and see how it simplifies your code? Happy coding!