How to Decode a List of enum as Root Element in Kotlin Excluding unknown Elements

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How to Decode a List of enum as Root Element in Kotlin Excluding unknown Elements

The Problem Explained

Imagine you have a JSON array like this:

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

You want to decode this JSON into a list of enum types in Kotlin but need to ignore the unknown value. Instead, your desired output should either be a list containing only valid enum values or perhaps a list with null values for each unknown entry, depending on how you choose to handle unknowns.

The Solution

To implement a solution, we will utilize the KindListSerializer, a custom serializer, to decode the list while excluding values recognized as unknown. Here’s how to do it step-by-step.

Step 1: Define Your Enum Class

First, you need to define your enum class that corresponds to the valid values you expect. For example:

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

Step 2: Creating the Serializer

We then create a KindListSerializer that will handle decoding:

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

Step 3: Decode Your JSON

With your serializer in place, you can now decode the JSON string directly. Here's how you can do it:

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

This code will allow you to decode the JSON string into a list excluding the unknown values.

Summary

Key Takeaways

Filtering unwanted values can be handled systematically through list manipulation.

Always define your enums carefully—this ensures that your application logic remains sound.

By understanding how to implement these steps, you’ll be well-equipped to handle similar challenges in your own projects. Happy coding!