polymorphic-effects

Algebraic effects are a programming language feature that allows composable handling of side effects. Effect handlers provide a structured way to manage computational effects like I/O, state, and exceptions in a type-safe manner.

Effect polymorphism and row typing are implemented by tracking effect rows in the type system to safely infer side effects. This Skill provides expertise in designing these advanced type systems for languages like OCaml and Haskell.

Effect rows group multiple computational effects into a single type record, allowing functions to specify exactly which side effects they perform. This mechanism enables robust, composable code by tracking effect polymorphism across function calls.

Bidirectional type checking is a prerequisite dependency for this Skill. It provides the foundational type inference mechanism needed to effectively implement and reason about advanced polymorphic effect systems and handler polymorphism.

The best approach is leveraging effect inference and handler polymorphism to manage I/O, state, and exceptions extensibly. This Skill offers theoretical foundations and practical guidance for designing sophisticated effect type systems.

Handler polymorphism allows different effect handlers to be interchanged without altering the underlying code logic. This ensures computational effects remain modular and composable, solving the complexity of managing side effects in advanced type systems.