<ul><li>The concept of making invalid states unrepresentable focuses on avoiding methods like isX and relying on the type system to ensure the validity of the state.</li><li>Using is methods or enums to check states can lead to runtime exceptions and requires additional error handling.</li><li>By designing types that represent valid and invalid states, we can simplify the code and rely on the type system for verification.</li><li>Type-driven design improves the development experience and ensures that our code accurately represents business rules, preventing invalid states from existing.</li></ul>

🏗️ `Is` Methods

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