How to Filter and Sort an Array of Objects in JavaScript by Key Words

Discover how to filter and sort an array of objects in JavaScript using substring matching for keys. Learn efficient coding techniques to handle data arrays effortlessly.
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This video is based on the question https://stackoverflow.com/q/66748984/ asked by the user 'Hadi Pawar' ( https://stackoverflow.com/u/7396313/ ) and on the answer https://stackoverflow.com/a/66749123/ provided by the user 'Barmar' ( https://stackoverflow.com/u/1491895/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

In programming, especially when working with JavaScript, handling data efficiently is crucial. One common scenario developers encounter is needing to filter objects within an array based on specific key names. In this post, we will explore a problem faced by many JavaScript developers: How to filter an array of objects by keys that include a certain keyword. We will analyze the problem, and then we will break down a simple yet effective solution.

The Problem

Imagine you have an array of objects, each with various properties. The goal is to separate these objects based on whether their keys contain a specific word, in this case, "Other." This entails:

Collecting all objects that have keys containing the word "Other."

Sorting the remaining objects based on their values, from highest to lowest.

This challenge is more complex than it seems at first glance, particularly when trying to perform substring matches like you might with SQL's LIKE function. Let’s dive into a specific case to illustrate this.

Given Array of Objects

Consider the following array of objects that we’re working with:

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

Here, we want to filter out items with keys like "Other" or "Other - WA" while sorting the rest by their corresponding values.

The Solution

To tackle this problem, we will leverage the Array.forEach() method, along with Object.keys() and String.includes(), to filter and sort our array efficiently.

Step 1: Create Separate Arrays

We'll create two arrays: one for items with keys containing "Other" and another for the rest.

Here’s how to implement it:

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

Step 2: Sort Remaining Items

Now that we have our two arrays, we proceed to sort the not_other array by values. To achieve this, we'd need a reliable approach to sort by the values of the objects:

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

Step 3: Combine the Arrays

Once both arrays are prepared — with other holding the "Other" items and not_other sorted by values — we can combine them into a single array using the spread operator:

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

Conclusion

In conclusion, we have solved the challenge of filtering and sorting an array of objects based on key names and their values using JavaScript. By employing simple yet effective coding techniques, we can efficiently handle complex data arrays. This method not only addresses the problem at hand but also sets the stage for further enhancements and modifications should your requirements change in the future.

Implementing these coding practices will help streamline data manipulation tasks in your JavaScript projects, leading to cleaner, more efficient code.

Feel free to experiment with the proposed solution to solidify your understanding and adapt it to your specific use cases!

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