How to Group Array of Objects into 2D Arrays by Nested Values in JavaScript

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How to Group Array of Objects into 2D Arrays by Nested Values in JavaScript

When working with arrays of objects in JavaScript, you may encounter situations where you need to organize your data based on a specific attribute. A common requirement is to group objects by their nested values. For example, you might have an array of objects that contains a name field and you want to sort them into sub-arrays based on these names. Let’s explore how to accomplish this using JavaScript.

The Problem

Imagine you have an array structured as follows:

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

You want to group this array into a new structure, where each unique name value has its own sub-array. The desired output would look something like this:

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

To achieve this, we need a method to group these objects dynamically since we can’t manually check each name one by one.

The Solution

Initialize the Reducer: Start by defining an empty accumulator object where each property corresponds to a unique name from the objects.

Iterate through the Array: For each object in the array, check if the name already exists as a property in the accumulator. If it does, append the object to that property’s array; if not, create a new array with the object.

Implementation

Here’s the complete code demonstrating this:

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

Explanation of the Code

reduce() Function: This function iterates over each element in array1. The callback function takes two parameters: acc (the accumulator) and cur (the current object).

Conclusion

Feel free to use the provided code as a template for your own projects or data processing tasks!