# hamler-lang/hamler

Haskell-style functional programming language running on Erlang VM.

Repository: https://github.com/hamler-lang/hamler
Canonical: https://ross.abutalabs.com/products/hamler
Homepage: https://www.hamler-lang.org/
Language: Erlang
License: BSD-3-Clause
License Family: permissive
Topics: hamler, compiler, programming-language
Last push: 2022-02-03T11:22:57+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2694, "days_push": 1672, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1038, forks 39 (observed 2026-08-28T04:03:19.731231+00:00)

## What it is
Hamler is a strongly-typed, Haskell-style functional programming language that compiles to Erlang VM (BEAM) bytecode. It brings compile-time type checking, ADTs, type classes, and monadic abstractions to Erlang's concurrency, distribution, and fault-tolerance model.

## Use cases
- write type-safe functional code on the Erlang VM
- build scalable real-time applications for 5G and IoT
- add compile-time type checking to BEAM development
- learn Haskell-style programming with Erlang concurrency
- develop fault-tolerant distributed systems with ADTs and pattern matching

## When to choose
- you want Haskell/ML-style typing and syntax with BEAM's concurrency and fault tolerance
- you're building soft real-time, distributed systems like MQTT brokers or edge/IoT services
- you prefer compile-time type checking over Erlang's dynamic typing

## When to avoid
- you need a language with active development and a large community - the last release was early 2022
- you need a mature ecosystem with extensive libraries and tooling
- you're fine with plain Erlang or Elixir and don't need static typing

## Facets
- artifact type: cli-tool
- maturity: maintenance
- function: compiler, programming-language, concurrency
- domain: programming-languages, compilers, iot
- platform: elixir, windows
- tags: haskell-style, beam, functional-programming, type-system, erlang-vm, adt, pattern-matching, programming-language, real-time, linux, macos, docker

## Member repositories
- hamler-lang/hamler (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:19.731231+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 2026-08-30T08:33:48.819261+00:00, confidence not recorded.
  - readme: https://github.com/hamler-lang/hamler (fetched 2026-08-28T04:03:19.731231+00:00, sha 25f044f459c4)
  - homepage: https://www.hamler-lang.org/ (fetched 2026-08-29T13:04:53.573176+00:00, sha 82f613b89646)
- Data as of 2026-08-30T08:39:29.467469+00:00.