BQN - Programming language

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BQN, aka Big Questions Notation, is a programming language created in 2020 by Marshall Lochbaum.

#421on PLDB

4Years Old

Download source code:

git clone https://github.com/mlochbaum/BQN

Homepage · REPL · Source Code · Docs

An APL-like programming language. Self-hosted!

Tags: programming language, arrayLang
BQN is developed on GitHub and has 867 stars
Early development of BQN happened in https://github.com/mlochbaum/BQN/issues
APL influenced the design of BQN
BQN is written in BQN, HTML, Markdown, Vim script, JavaScript, XML, AutoHotkey, CSS, SVG
Explore BQN snippets on Rosetta Code
1 PLDB concepts link to BQN: BQN

Example from the web:

#! /usr/bin/env bqn

# Case conversion utilities
case ← {
  diff ← -´ "Aa"
  Lower ⇐ -⟜diff
  Upper ⇐ Lower⁼
}

hw ← <˘ 2‿∘ ⥊ "helloworld"
hw case.Upper⌾(⊑¨)↩
•Out hw ↩ ∾ ⥊⍉ [hw, ", "‿"!"]  # Hello, World!

# Split at spaces and repeated characters
Split ← {
  !1==𝕩 ⋄ (!2=•Type)¨𝕩
  Proc ← {
    · 𝕊 ' ': spl⇐1 ;             # Space: break and delete it
    prev Fn cur: ⟨spl,str⟩⇐
      spl←0 ⋄ str←⟨cur⟩          # Include and don't break...
      { prev=cur ? spl+↩1 ; @ }  # except at equal characters
  }
  GV‿GS ← {𝕏¨}¨ ⟨ {⟨s⇐str⟩:s;""}
                  {𝕩.spl} ⟩
  r ← Proc{»𝔽¨⊢} 𝕩
  (∾¨ GV ⊔˜ ·+`GS) r
}
•Show Split hw  # ⟨ "Hel" "lo," "World!" ⟩