lloydmeta/frunk

Health v2 · maintenance only

Adoption not part of the score

1459 stars · 70 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Frunk is a Rust library providing functional programming and type-level programming tools such as HLists, Coproducts, Generic/LabelledGeneric derivations, Validated, Semigroup, Monoid, and lenses. It enables datatype-generic programming patterns in Rust with compile-time guarantees.

Use cases

• work with heterogeneous lists in rust
• convert between structs and tuples generically
• derive generic representations for my types
• accumulate validation errors functionally
• combine monoids like tuples and options
• use coproducts instead of enums for generic code
• write type-level generic programming in rust
• access struct fields via lenses

When to choose

• you need datatype-generic programming or generic representations in Rust
• you want statically typed heterogeneous lists or coproducts
• you need functional abstractions like Monoid, Semigroup, or Validated
• you want to build libraries that derive conversions between types

When to avoid

• you only need simple everyday application logic without generic abstractions
• you want to avoid compile-time overhead from heavy type-level machinery
• your team is unfamiliar with functional programming concepts and type-level programming

Facets

library · maturity stable

serialization developer-tools programming-languages developer-tools rust hlist coproduct type-level-programming generic-programming monoid semigroup validated lenses functional-programming derives algorithms

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