Скачать или смотреть Summing Values and Grouping by Status in JavaScript Arrays of Objects

Learn how to sum total values and group by status in JavaScript arrays of objects for effective data management.
---
This video is based on the question https://stackoverflow.com/q/64692553/ asked by the user 'Kaung Khant Zaw' ( https://stackoverflow.com/u/11866037/ ) and on the answer https://stackoverflow.com/a/64692982/ provided by the user 'Guruparan Giritharan' ( https://stackoverflow.com/u/1435722/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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: Sum total and make an array which count by same values from array of objects

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Summing Values and Grouping by Status in JavaScript Arrays of Objects

Managing and manipulating data can often be challenging, especially when dealing with arrays of objects that contain various attributes. One common scenario is when you need to sum total values based on a specific key (like Category_Name) and categorize the data by other attributes (like Status_Name). In this guide, we’ll walk through a step-by-step approach using JavaScript, specifically leveraging the power of the reduce method to achieve our goal.

The Problem

Let’s say you have an array of objects that looks like this:

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

The goal is to group this data based on Category_Name, calculate the total count for each category, and also create a new array for the status that captures how many items fall under each status (like Available, Good Condition, and Requested).

The expected output would look something like this:

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

The Challenge

You’ve managed to successfully sum the counts for each category but struggled with the creation of the status array that should count the instances of each status for the respective categories. Let’s dive into how we can achieve this efficiently.

The Solution

We will use the reduce method to iterate through the array and create a new array that summarizes the information as desired. Here’s how to do it:

Step-by-Step Code Implementation

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

Putting It All Together

Now that we have our reducer function, we can simply call reduce on our data array:

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

Explanation of the Code

Reducer Function: This function takes two parameters, acc (accumulator) and curr (current item). It checks if the current item's Category_Name already exists in the accumulator.

Status Management: It uses a dynamic key for the status counts by replacing spaces with underscores.

If Item Exists: If the category already exists, it updates the total count and the corresponding status count.

If Item Does Not Exist: If it doesn't find the category, it creates a new object with the category name, initializes the total count and status counts, and adds it to the accumulator.

Using this method, you can efficiently manage complex data structures with ease. This approach not only streamlines the coding process but also enhances readability and maintenance of your code.

Conclusion

In this article, we tackled a common data manipulation problem in JavaScript: grouping and summing values in an array of objects. By utilizing the reduce method, we structured our data in a way that’s not only efficient but also easy to understand. With a firm grasp of these techniques, you're one step closer to mastering JavaScript data management.

Happy Coding!