Скачать или смотреть How to Filter JavaScript Objects by Matching Property Values

Learn how to effectively filter JavaScript objects based on specific property values using arrays. This guide includes practical examples and clear explanations for beginners.
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Filtering JavaScript Objects by Matching Property Values

In the realm of programming, especially when dealing with JavaScript arrays, one common task is filtering objects based on specific criteria. In this guide, we'll explore how to filter objects to show only those that match a given field value present in a specified array. This is particularly useful when you want to display only a certain subset of data, such as promotional banners or advertisements.

The Problem: Filtering Banners by Code

Consider the following scenario: you have a list of banners, and each banner has a unique code associated with it. You also have an array of codes, which represent the banners you want to show. Your goal is to display only the banners that have codes included in this array. For example, given the following data:

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In this scenario, you’d want to filter out the banner with the code 54344, since it is not present in the keys array. Let’s see how to achieve this using JavaScript.

The Solution: Using the Filter Method

To solve this problem, we can take advantage of the filter method available in JavaScript arrays. The filter method creates a new array with all elements that pass the test implemented by the provided function.

Step-by-Step Filtering Process

Define Your Key Codes: Start with an array of codes that you want to filter by (in this case, keys).

Use the Filter Method: Call the filter method on the banners array and check if each banner's code exists in the keys array using the includes method.

Here’s a clear example of how you can implement this:

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Breaking It Down

Function Explanation:

The filter method takes a function that tests each element (in this case, each banner).

For each banner, we check if its code is included in the keys array.

Returns: The filter method returns a new array containing only the banners whose codes are found in the keys array.

Final Output

After executing the above code, filteredBanners will contain:

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This output successfully excludes the WelcomeBonus banner since its code 54344 is not present in the keys array.

Conclusion

Filtering arrays is a powerful feature of JavaScript that allows you to manipulate data efficiently. By using the filter method, you can easily display only the objects that meet your specific criteria. Whether it’s banners, users, products, or any other data type, mastering this technique will enhance your ability to create dynamic and responsive applications.

Key Takeaways

Use filter to create an array of items based on certain conditions.

Combine filter with includes for checking multiple values effectively.

Simplifying your data can lead to better user experiences and cleaner applications.

Now you are equipped to handle similar filtering challenges in your JavaScript projects! Happy coding!