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Learn how to sort your grouped objects in JavaScript while maintaining their structure using Lodash's `groupBy` and custom logic.
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This video is based on the question https://stackoverflow.com/q/63363065/ asked by the user 'EmmanuelBeziat' ( https://stackoverflow.com/u/4231598/ ) and on the answer https://stackoverflow.com/a/63363292/ provided by the user 'Philip Moy' ( https://stackoverflow.com/u/11820657/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Keep the GroupBy Object Format After OrderBy in JavaScript Using Lodash

When working with data in JavaScript, especially when using libraries such as Lodash, you may encounter situations where you need to group and sort objects. One common problem is grouping an array of objects (like shops) by a property (e.g., country) and then sorting that result without losing its initial format. This guide will guide you through the steps needed to achieve this efficiently.

The Problem at Hand

Imagine you have an array of shop objects, each containing a country property. You want to group these shops by their respective countries using the .groupBy() method from Lodash. This may give you an output like so:

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

At this stage, the grouped data is not sorted. You might want to sort them based on the number of shops per country and retain the object structure. Attempting to use the .orderBy() method can lead to an array output, which loses the key names (country names):

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

Thus, the main challenge is to sort the countries based on the number of shops while keeping the structure of an object.

The Solution Process

Step 1: Sort the Country Keys

First, you'll want to list out the keys of the grouped object (country names) and sort them based on the length of the corresponding arrays (the number of shops). Here's how you can do it:

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

Step 2: Reconstruct the Object

After sorting the keys, the next step is to reconstruct the original object format with the sorted keys. This can be done using the reduce() function, which allows you to build a new object incrementally:

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

Example Code

Here it is, all put together in a single snippet:

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

Why This Matters

Sorting your data while keeping its structure is crucial for data visualization and analysis. For example, if you're making charts, you need the top countries displayed first, ensuring that your visual representations are clear and informative.

Conclusion

In this post, we've tackled the common problem of needing to sort a grouped object without losing its format. By using a simple two-step process of sorting keys and reconstructing the object, you can achieve your data organization goals effectively.

If you ever find yourself needing to sort and maintain the integrity of your object structure in JavaScript, remember this approach! Happy coding!