Скачать или смотреть How to Efficiently Check if an Array Contains Multiple Values and Group Items in JavaScript

Learn how to check for specific values in an array of objects in JavaScript, and how to organize items into separate arrays based on those values.
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This video is based on the question https://stackoverflow.com/q/68634639/ asked by the user 'Asher' ( https://stackoverflow.com/u/11636413/ ) and on the answer https://stackoverflow.com/a/68634841/ provided by the user 'Sajeeb Ahamed' ( https://stackoverflow.com/u/4610740/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Efficiently Check if an Array Contains Multiple Values and Group Items in JavaScript

If you're diving into JavaScript, particularly when dealing with arrays, you might run into a common challenge: how to check if an array contains specific values and categorize those items into new arrays. In this guide, we'll walk you through a practical example that demonstrates this process using an array of objects containing various tags.

The Problem: Organizing Items Based on Tags

Imagine you have a dataset consisting of an array of objects, where each object represents an item with certain tags associated with it.

Here's an example of what your data might look like:

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

Your goal is to check the tags array for each item and classify these items into different arrays based on the tags they hold.

Setting Up the Arrays

Before we dive into the solution, let’s set up our state (if you are using React). We’ll create empty arrays for each category you want to classify:

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

Solution: Using a Loop to Classify Items

Step 1: Initialize Category Arrays

Start by creating temporary arrays that will hold the classified items:

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

Step 2: Loop Through Each Item

Next, loop through each item in the data. Here’s how we can do this:

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

Breakdown of the Code

Outer Loop: Iterates through each item in the data array.

Check Tags: Uses optional chaining to verify that the tags array exists and has elements.

Inner Loop: Loops through each tag of the current item.

Switch Statement: Checks the value of the tag (converted to lower case) and pushes the entire item into the corresponding temporary array.

Step 3: Update State

Once you have classified the items, it's time to update your state with these temporary arrays:

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

Putting It All Together

Here's the complete code for your reference:

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

Conclusion

In this guide, we explored how to check if an array contains multiple values and categorize items into different arrays in JavaScript. By using loops and conditional statements effectively, you can efficiently organize your data for better accessibility and rendering in your UI.

Happy coding!