Grouping Objects in Node.js: An Effective Approach to Object Aggregation

---

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: Nodejs: Object aggregation

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---

Understanding the Problem

Consider the following example of an object array:

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

In this array, each object contains an attr_id, a type, a value_index, and a value_label. The goal is to convert this array into a format where each unique combination of attr_id and type has its associated values grouped together. The expected output structure is:

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

Step-by-Step Solution

Step 1: Grouping by Attributes

We'll begin by creating a utility function that utilizes array reduction to group the objects based on specified attributes.

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

Step 2: Mapping to Final Structure

After grouping, the next step is to map the grouped data into the desired output format.

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

Step 3: Combining the Functions

Now, let’s bring both functions together and run them with the normalized list.

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

Advanced Grouping: Using Multiple Attributes

If you want to generalize your function to allow grouping by more than one attribute, we can extend the functionality slightly.

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

Usage Example

Once you implement the grouping function, you can call it as such:

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

Conclusion