[Haskell'23] The Evolution of Effects

Step-by-Step Tutorial: Understanding the Evolution of Effects in Haskell

1. Start with Historical Context: Understand the historical context of the dichotomy between functional and imperative programming, starting from the early days of computer science with Church and Turing.

2. Explore the History of Programming Languages: Dive into the history of programming languages, starting from the creation of Lisp in 1958 by McCarthy, which introduced the Lambda calculus, recursion, conditionals, and other key concepts.

3. Learn about ALGOL: Explore the invention of ALGOL, a language designed to combine functional and imperative thoughts into a single paradigm, showcasing the use of applicative expressions and imperative applicative expressions.

4. Discover the Next 700 Programming Languages Paper: Delve into the influential paper "The Next 700 Programming Languages" by Peter Landin, which introduced concepts like pattern matching, wear clauses, garbage collection, and indentation sensitivity.

5. Understand Denotational Semantics: Learn about the importance of denotational semantics in programming languages, where the meaning of the whole is derived from the meaning of its parts, as discussed by Landin and others.

6. Explore Monads and Category Theory: Delve into the concept of monads in the context of category theory, starting from foundational work by Dana Scott and continuing through the development of monads in functional programming.

7. Study Algebraic Effects and Effect Handlers: Understand the evolution of algebraic effects and effect handlers in Haskell, including the introduction of libraries like Fused Effects and the significance of higher-order effects and handlers.

8. Consider the Future of Algebraic Effects: Reflect on the current state of algebraic effects in Haskell and the ongoing research towards a unified framework for handling effects in a more expressive and efficient manner.

By following these steps, you can gain a comprehensive understanding of the evolution of effects in Haskell, from its historical roots to the latest developments in algebraic effects and effect handlers.