Merging Two JSON Arrays into One in Node.js

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Understanding the Problem

Let’s say you have two JSON arrays that look like this:

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Your goal is to merge these two arrays into a single array that looks like this:

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Essentially, you want to combine related pieces of information into one cohesive array. If both objects share a property name, it's important to consider how to handle these overlaps effectively.

Solution: Merging with Lodash

To achieve this merge efficiently, we can leverage the power of the Lodash library. Lodash is a popular utility library in JavaScript that provides helpful functions for common programming tasks, including array and object manipulation.

1. Installing Lodash

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2. Importing Lodash

After installing Lodash, you need to import it into your JavaScript file:

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3. Merging the Arrays

Now, with Lodash at your disposal, you can easily merge the two JSON arrays. Lodash's merge() method is a robust solution that not only merges objects but also handles nested properties. Here's a step-by-step breakdown of the merging process:

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4. Explanation of the Code

Map the second array: We are transforming json2 into a format that matches the structure we want in the final array. By using map, we create new objects for each element in json2 that hold the properties id and name.

Use _.merge(): This method will merge the mapped objects from json2 with the objects from json1. The result is a single array that combines data from both original arrays while maintaining the integrity of the information.

Example Output

When you run the above code, you should get an output like this:

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As you can see, the two arrays have been merged seamlessly into one.

Conclusion

By following these simple steps, you can consolidate data from various sources easily, paving the way for better data management and utilization in your applications. Happy coding!