Functional Programming Deep Dives

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A weekly deep dive into the best functional programming blog posts — covering core FP theory, language-specific ecosystems, and practical patterns in mainstream languages.

2026-08-24

Rust's next-generation trait solver: a nightly deep read

A deep read of the Rust team's August 21 announcement: what the next-generation trait solver changes, how its performance evidence should be read, and how to test nightly safely.

Functional Programming Deep Dives

2026-08-17

Return the intent, run the effect: a Wolverine deep read

A deep read of Jeremy Miller's August 13 case study on using Wolverine's returned side-effect values to keep C# business endpoints focused, testable, and explicit about execution boundaries.

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Functional Programming Deep Dives

2026-08-10

`forall` chooses for you: a Haskell parametricity deep read

A deep read of Justin Le's August 4 essay on how Haskell's parametric polymorphism turns missing type information into guarantees about implementations, data shape, and resource scope.

Functional Programming Deep Dives

2026-07-27

The generator is the shrinker: a falsify deep read

A deep read of Edsko de Vries's 17 July explanation of falsify 0.4.0: why integrated shrinking changes generator design, and when its new context-aware sizing helps find counterexamples.

Functional Programming Deep Dives

2026-07-20

Inside the ST boundary: a Haskell deep read

A deep read of Michael Snoyman's analogy between Haskell's immutable values, local mutation in `ST`, and the type boundary that keeps state from escaping.

Functional Programming Deep Dives

2026-07-13

JSON's hidden contract: a Mark Seemann deep read

A deep read of Mark Seemann's argument that JSON's simplicity pushes data contracts into schemas, code, and production behavior. The issue connects his XML-versus-JSON claim to FP habits such as parsing at boundaries and making illegal states visible.

Functional Programming Deep Dives

2026-07-09

Monads need syntax: a Go deep read

A deep read of Omer Preminger's argument that monads only pay off in Go when the language gives them native-feeling syntax. The issue explains why `Result` feels natural in Rust but awkward as a plain Go library abstraction, and what that means for importing FP ideas into mainstream codebases.

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