Efficiently Filter Your Kid Array by Parent Array Elements in Swift

Learn how to filter a kid array in Swift based on the elements of a parent array, using an example with `Card` and `Product` classes. Enhance your data handling skills!
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Filtering a Kid Array by Parent Array Elements in Swift

When working with data models in Swift, you may encounter scenarios where you need to filter data based on relationships between different entities. One common requirement is merging two entities and filtering one based on the other. In this guide, we'll explore how to efficiently filter a "kid" array using elements from a "parent" array, specifically within the context of Swift data models.

The Problem

Let’s say you have two data models defined as Card and Product. Each Card has a specific type, name, and icon, while each Product has an optional type, an image URL, and some content. Your goal is to create a new data structure MergedData that combines details from Card and only those Product items that share the same type.

Here’s a quick look at how these models are structured:

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

You also have a DemoViewModel class that contains arrays of Card and Product, and a method getMergedData() where you'll implement the merging logic.

The Solution

To achieve the merging and filtering, we can implement the getMergedData() function within the DemoViewModel. Below are the steps to accomplish this:

Step 1: Understanding the Data Structure

MergedData needs to contain:

The type (shared between Card and Product).

The name from Card.

The icon from Card.

An array of Product, filtered based on matching types.

Here’s how the MergedData class looks:

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

Step 2: Implementing the Filtering Logic

Now, let's write the code for getMergedData(). We will loop through each Card and filter the Product array based on the type of each Card. Here’s how you do it:

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

Explanation of the Code

Map through Cards: We iterate over each Card using map. This allows us to create a new MergedData object for each Card.

Creating MergedData Objects: For every Card, we initialize a MergedData object with:

The card's type, name, and icon.

A filtered array of Product instances, where the type of Product matches the type of the Card.

Filter Products: The filtering is done using the filter method, which checks if the type of each Product matches the Card being processed.

Conclusion

Filtering a kid array by parent array elements in Swift can be accomplished with straightforward mapping and filtering techniques. By structuring your data models carefully and using Swift’s powerful collection methods, you can effectively merge and filter data with minimal code and maximum clarity.

Implementing this solution makes your Swift applications smarter and more efficient when handling related data. Keep exploring more such techniques to enhance your coding skills!

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