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BQN documentation

BQN's documentation describes what features it has, how to use them (with examples), and why they were chosen. For a linear introduction to the language, see the tutorials. For all of the particulars without so much discussion, see the specification.

The quick start page is a hands-on way to see what features BQN offers so you can start with the parts you're most interested in.

Overview:

• Syntax
• Types
• Primitives
• Paradigms
• See also help index; summary gist
• And system values (not always implemented)

References:

• Glossary
• BQN-Dyalog dictionary
• BQN-J dictionary
• BQN as combinatory logic

Concepts:

• Tokens and constants
• Expression syntax
  • Context-free grammar
• Arrays
  • Based array theory
  • Array notation and display
  • Array indices
  • Fill elements
  • The leading axis model
• Functions and modifiers
  • Functional programming
• Tacit programming
  • Function trains
• Blocks
  • Lexical scoping
  • Control flow
• Namespaces
  • Object-oriented programming

Primitives:

• Arithmetic: +-×÷⋆√⌊⌈|≤<>≥=≠
• Array depth: ≡ and ⚇
• Array dimensions: ≢=≠
• Assert and Catch: ! and ⎊
• Atop and Over: ∘○
• Before and After: ⊸⟜
• Cells and Rank: ˘⎉
• Choose: ◶
• Constant: ˙
• Deshape and Reshape: ⥊
• Enclose: <
• Find: ⍷
• Fold and Insert: ´˝
• Group: ⊔
• Identity functions: ⊢⊣
• Indices and Replicate: /
• Join and Join To: ∾
• Logical functions: ∧∨¬
• Mapping: ¨⌜
• Match: ≡≢
• Ordering functions: ∧∨⍋⍒
• Pair: ⋈
• Pick: ⊑
• Prefixes and Suffixes: ↑↓
• Range: ↕
• Repeat: ⍟
• Reverse and Rotate: ⌽
• Scan: `
• Search functions: ⊐⊒∊
• Select: ⊏
• Self and Swap: ˜
• Self-search functions: ⊐⊒∊⍷
• Shift functions: »«
• Solo, Couple, and Merge: ≍>
• Take and Drop: ↑↓
• Transpose: ⍉
• Under: ⌾
• Undo: ⁼
• Valences: ⊘
• Windows: ↕

Environment:

• Foreign Function Interface (FFI)
• Embedded BQN
• ReBQN