Arrow Raise DSL: Composing Typed Errors
Use Arrow's Raise context and raise() to compose multi-error flows cleanly.
The Limitation of Either Chaining
Chaining Either with flatMap creates deeply nested lambdas when you have multiple sequential operations. Arrow's Raise DSL (introduced in Arrow 1.2) offers a cleaner, coroutine-style syntax using Kotlin's context receivers or extension functions.
What Is Raise<E>?
Raise is a context that can raise (short-circuit with) an error of type E. A function that can fail calls raise(error) to abort and propagate the error, similar to throwing but without exceptions.
All lessons in this course
- Either : Typed Error Handling Without Exceptions
- Arrow Raise DSL: Composing Typed Errors
- Option and Nullable: When to Use Each
- Functional Domain Modeling with Arrow's Core Types