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Learn how to effectively decode an array of objects from an API call in Swift using the Codable protocol and JSONDecoder.
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Decoding an Array of Objects Returned in API Calls with Swift

When working with APIs, it's common to receive data in JSON format. This data often comes in the form of an array of objects, which can be daunting to handle if you're not familiar with the proper methods in Swift. In this post, we're going to explore how to decode an array of objects returned from an API call in Swift, ensuring that you can effectively interact with the data you receive.

Understanding the Problem

Imagine you have an API that returns flight data in JSON format that looks something like this:

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You might have created a Swift structure to define how the data should be represented with the Codable protocol. The proposed structure looks like this:

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However, you might be wondering if this structure is sufficient or if there's a more efficient way to decode this data.

The Solution: How to Decode JSON in Swift

Step 1: Define Your Model

Your model, LastTenOrders, is indeed a good start! It correctly represents the structure of the JSON objects you expect from the API. By conforming to the Codable protocol, Swift allows easy encoding and decoding of this struct.

Step 2: Create a Type Alias

To make your code cleaner when handling an array of these objects, you can use a type alias. This isn't necessary, but it can improve readability. Here's how you can define a type alias for an array of LastTenOrders:

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Step 3: Decoding the JSON Data

You can decode the JSON data using JSONDecoder. Here's how you can do it in two ways:

Option 1: Using Type Alias

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Option 2: Directly Decoding the Array

If you prefer to keep it simple, you can decode it directly like this:

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

Things to Keep in Mind

Make sure that jsonData is properly formatted and represents the JSON you expect from the API. Incorrectly formatted data can lead to decoding errors.

Always handle potential errors when decoding JSON. Using try? can be helpful for optional handling but consider using do-catch blocks for better error handling.

Conclusion

In summary, decoding an array of objects returned in an API call is straightforward with Swift. By defining your model using the Codable protocol and utilizing the JSONDecoder, you can efficiently work with the data returned from APIs. The structure you created is perfectly valid, and using type aliases can enhance your code's clarity. Happy coding!