Скачать или смотреть How to Filter an Array of Objects Dynamically in JavaScript

Learn how to filter an array of objects based on dynamic keys and values, even when their properties are unknown.
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How to Filter an Array of Objects Dynamically in JavaScript

Filtering arrays of objects can be tricky, especially when you don't know the properties in advance. If you're dealing with a scenario where you need to filter an array based on another "filter" object with potential dynamic properties, you're not alone! In this guide, we will discuss how to achieve exactly that in JavaScript.

Understanding the Problem

Imagine you have the following array of objects, representing some data entries:

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

Now, you also have a filter object like this:

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

Your goal is to filter myArray based on the criteria defined in myFilter, resulting in an array of objects that match those criteria. For instance, the expected output would be:

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

The Solution: Using JavaScript filter() and every() Methods

To filter the array without knowing the properties in advance, you can leverage JavaScript's filter() method along with every(). Follow these steps to implement the solution:

Step-by-Step Breakdown

Use the filter() Method: This method creates a new array with all elements that pass the test implemented by the provided function.

Iterate Over Each Filter Key: For each item in the filter object, check if it exists in the current object from the main array.

Use Object.keys(): This method retrieves the keys of the filter object, and the every() method ensures that all criteria defined in the filter object are met by each object in the array.

Example Code

Here's how to implement the solution in code:

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Output

When you run the above code, you'll get the following output:

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

Handling Undefined Properties

What if the filter contains a property that doesn't exist in the objects? In such cases, the filter will simply not match any records, and you will receive an empty array as expected.

For example:

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

In this scenario, filtering myArray will yield:

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

Conclusion

Filtering an array of objects dynamically, without knowing the specific properties in advance, can seem daunting. However, with a powerful combination of JavaScript's array methods like filter() and every(), it becomes quite manageable.

This technique can be especially helpful in scenarios where data is user-defined or comes from various external sources. By mastering this approach, you will enhance your ability to handle unpredictable data structures effectively!

Feel free to experiment with different filter objects and see how they impact the resulting array!