# lexi-lambda/hackett

WIP implementation of a Haskell-like Lisp in Racket

Repository: https://github.com/lexi-lambda/hackett
Canonical: https://ross.abutalabs.com/products/hackett
Homepage: https://lexi-lambda.github.io/hackett/
Language: Racket
License: ISC
License Family: permissive
Topics: racket
Last push: 2024-04-14T16:40:55+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3615, "days_push": 871, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1205, forks 51 (observed 2026-08-28T04:03:59.285225+00:00)

## What it is
Hackett is an experimental, statically typed, pure, lazy functional programming language implemented as a Racket #lang, combining Haskell-style features with Racket's macro system. It is built using the 'Type Systems as Macros' technique and remains a work-in-progress.

## Use cases
- experiment with a haskell-like lisp language
- implement statically typed macros in racket
- learn how type systems as macros work
- try bidirectional type inference and typeclasses
- explore lazy functional programming with s-expression syntax

## When to choose
- you want to explore typed functional programming inside the Racket ecosystem
- you are researching type-directed macros or type-system-as-macro techniques
- you want to experiment with Haskell features like ADTs and typeclasses in a Lisp syntax

## When to avoid
- you need a stable, production-ready language
- you need gradual typing or dynamic typing
- you require complete Haskell compatibility or features like GADTs and type families

## Facets
- artifact type: library
- maturity: experimental
- function: programming-language, type-system, interpreter
- domain: programming-languages, compilers
- platform: cross-platform
- tags: haskell-like, lisp, static-typing, type-inference, typed-macros, lazy-evaluation, racket-lang, macro, functional-programming, racket

## Member repositories
- lexi-lambda/hackett (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:59.285225+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:19:35.950094+00:00, confidence not recorded.
  - readme: https://github.com/lexi-lambda/hackett (fetched 2026-08-28T04:03:59.285225+00:00, sha c9e16a0eb645)
  - homepage: https://lexi-lambda.github.io/hackett/ (fetched 2026-08-29T12:27:08.173353+00:00, sha cee12a8f2e93)
- Data as of 2026-08-30T08:39:29.467469+00:00.