Summary
Kotlin’s powerful features, especially lambdas with receivers, make it an ideal language for crafting internal domain-specific languages. By using the type-safe builder pattern, we can create APIs that are not only expressive and readable but also benefit from Kotlin’s static typing and excellent IDE support.
In this chapter, we successfully built a DSL for defining Book objects. We saw how to structure builders, use lambdas with receivers to create nested configurations, and provide a clean entry point for the DSL. The resulting code for creating book instances is declarative, closely mirrors the domain’s structure, and is significantly cleaner than manual object instantiation.
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