# mlochbaum/BQN

An APL-like programming language

Repository: https://github.com/mlochbaum/BQN
Canonical: https://ross.abutalabs.com/products/bqn
Homepage: https://mlochbaum.github.io/BQN/
Language: BQN
License: ISC
License Family: permissive
Topics: apl, multidimensional-arrays, compiler, functional-programming, immutable, language, bqn
Last push: 2026-08-12T11:48:51+00:00

## Health v2 (maintenance only)
Score: 76/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 97, release rhythm 35, longevity 100
- inputs: {"age_days": 2280, "days_push": 21, "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 1075, forks 67 (observed 2026-08-28T04:03:29.258044+00:00)

## What it is
BQN is a modern APL-derived array programming language with infix notation, built-in multidimensional array operations, and first-class functions. The repository hosts its self-hosted compiler, specification, documentation, and a browser-based REPL, with a low-dependency C bytecode implementation (CBQN) for offline use.

## Use cases
- learn array programming in an APL-like language
- script and prototype with concise array notation
- number crunching on multidimensional arrays
- run APL-style code in the browser via a REPL
- embed an array language via C FFI

## When to choose
- you want a modern, cleaned-up APL with consistent semantics
- you work with multidimensional arrays and want built-in array operations
- you want good documentation and tutorials for learning array programming

## When to avoid
- you need a mature package manager and library ecosystem
- you need multi-threaded or distributed performance
- your team requires mainstream syntax and hiring pool

## Facets
- artifact type: application
- maturity: active
- function: programming-language, interpreter, compiler
- domain: programming-languages, data-science
- platform: cross-platform, cli, browser, c
- tags: apl, array-programming, functional-programming, bqn, self-hosted, repl, algorithms

## Member repositories
- mlochbaum/BQN (main) score 76

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:29.258044+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 2026-08-30T06:53:27.612282+00:00, confidence not recorded.
  - readme: https://github.com/mlochbaum/BQN (fetched 2026-08-28T04:03:29.258044+00:00, sha 17c1b6599d71)
  - homepage: https://mlochbaum.github.io/BQN/ (fetched 2026-08-29T12:55:01.057548+00:00, sha 7dd8542fa61a)
- Data as of 2026-08-30T08:39:29.467469+00:00.