kotlin-functional-fundamental

To refactor Kotlin code to pure functions, extract side effects to adapters and expose a pure API for core logic. This reduces side effects and produces predictable, testable, and composable code.

Functional error handling in Kotlin is best achieved using Result, Either, and Option types. These approaches improve reasoning and maintainability by avoiding exceptions for control flow in pure functions.

Yes, you can use Kotlin sequences for lazy pipelines to enable scalable data transformations. Function composition with sequences allows efficient processing in data processing modules and concurrent workflows.

Functional programming in Kotlin works with Java interop by applying incremental adoption guidance. This preserves existing Java investments while enhancing code quality through immutability and pure functions.

You should adopt functional programming in Kotlin to produce predictable, testable, and composable code. It solves the problem of imperative styles mixed with Java interop that make code harder to test and reason about.