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William Yao's Haskell Musings

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Latest posts

Why Monad Transformers Matter

Monad Transformers 101

Drawing Trees Functionally: Reingold and Tilford, 1981

Writing Servant combinators for fun and profit

Why continuation-passing style works, and the Cont monad

Getting better type errors by typing literally everything

Deriving the Writer monad from first principles

Deriving the Reader monad from first principles

Deriving the State monad from first principles

Reanimate: a tutorial on making programmatic animations

Reanimate: swearing at bad documentation

Permissive, then restrictive: concrete solutions and examples

Permissive, then restrictive: learning how to design Haskell programs

Things software engineers trip up on when learning Haskell

The road to proficient Haskell

Try the advanced stuff

Abstracting out common columns in Opaleye

Which type-safe database library should you use?

How does Haskell make your life easier?

A list of Haskell articles on good design, good testing

A dead-simple web stack in Haskell

A cheatsheet to JSON handling with Aeson

How to do basic error handling and logging in Haskell

You are already smart enough to write Haskell

Figuring out how to use Beam for DB migrations

A cheatsheet to the time library

How I read Haskell documentation

String interpolation and overlapping instances 101

Exercises for understanding lenses

A cheatsheet to regexes in Haskell

Deploying Haskell applications with ECS, Docker, and Nix

Hosting a static site using Hakyll and AWS