How to Extract Nested Keys from JavaScript Objects using Reduce

A step-by-step guide to using recursion and reduce in JavaScript for extracting nested keys from complex object structures.
---

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Get all the children objects key into new array of objects using reduce

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
How to Extract Nested Keys from JavaScript Objects using Reduce

In many programming scenarios, you may encounter complex data structures like nested objects. These can often be cumbersome to handle, especially if you need to extract specific keys from these structures. Today, we’ll delve into how to use JavaScript’s powerful reduce() method in combination with recursion to extract all child keys from a deeply nested object with multiple levels.

The Problem: Nested Object Structure

Consider an object structure that resembles a family tree or organizational hierarchy. Below is a sample representation of such an object:

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

This object contains various regions, countries, and further subdivisions, which can go up to 12-13 levels deep, making it difficult to pull out all the keys into a new array or object structure efficiently.

The Solution: Using Recursion with Reduce

To accomplish this task, a recursive function can facilitate the navigation of deep object layers. Here’s how you can structure this solution.

Step 1: Define Your Levels

First, establish the levels to categorize the keys. This means assigning names like "AREA", "SUPER_REGION", etc. for each depth level.

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

Step 2: Create the Recursive Function

Now, implement a function that traverses the object. Here’s the full implementation:

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

Step 3: Using the Function

Finally, call the function with your object structure:

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

Example Output

When you run the above code with the provided object, the output will be structured as follows:

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

Conclusion

Using recursion alongside JavaScript’s reduce() method allows you to easily extract keys from complex nested structures. By categorizing the keys based on their depth in the hierarchy, you can create a more organized representation of your complex data. This technique can be especially beneficial in data processing and manipulation tasks where object structures are prevalent.

Feel free to modify the level keys or structure to fit your specific needs!