Скачать или смотреть Grouping Data with Lodash, Underscore, or JavaScript

Learn how to group complex data structures in JavaScript using `Lodash`, `Underscore`, or native array functions. Follow our clear, organized guide for effective solutions!
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This video is based on the question https://stackoverflow.com/q/65058300/ asked by the user 'Julien Ambrosio' ( https://stackoverflow.com/u/9393641/ ) and on the answer https://stackoverflow.com/a/65058431/ provided by the user 'IRSHAD' ( https://stackoverflow.com/u/4164167/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Multilevel Grouping with Lodash, Underscore, or JavaScript

When working with arrays of objects in JavaScript, especially when the data is a little complex, you might run into the challenge of needing to group data by multiple levels. This scenario often arises when you are dealing with databases and need to organize the retrieved data into a more usable format. In this guide, we will show you how to achieve this using Lodash, Underscore, or native JavaScript array functions.

The Challenge

Consider you have an output from a database query that looks something like this:

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From this array of objects, you want to transform the data into a more structured format:

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The Solution

To achieve this grouping, we will utilize the reduce method in JavaScript, which is a powerful tool for transforming arrays. Below are the detailed steps to implement this function.

Step 1: Define Your Data

Start with your array of objects, which we will refer to as rawContent.

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Step 2: Use the Reduce Function

We will create a grouped object using reduce, where the keys will be a combination of the contents_id and contents_title. This will help to uniquely identify each content.

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Step 3: Convert Object Back to Array

After grouping the data, you need to convert the object created by reduce back into an array format.

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Example Code

Here is the complete code snippet to accomplish the task:

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Conclusion

In this post, we explored how to effectively group and structure data using JavaScript's reduce method, and this same pattern can be easily adapted to use with Lodash or Underscore if you prefer. By following these steps, you will be able to turn flat data structures into beautifully nested arrays that are easier to work with and manipulate.

Happy coding!