Naming conventions - GolfingSuccess/jelly GitHub Wiki

Single-letter atoms

• Uppercase letters with optional dots above or below represent monads.
  • Examples: A (absolute value), Ḃ (modulo 2).
• Lowercase letters, with dots above or below represent dyads.
  • Examples: g (GCD), ṙ (rotate list).
• Hooked letters represent nilads.
  • Example: ɠ (read STDIN line).
• Where possible, a letter with a dot below should be the (formal or informal) inverse operation of its dot-less counterpart.
  • Example: b is “to base” and ḅ is “from base”.

Double-letter atoms

• Double-letter nilads should start with Ø.
  • Example: Øa (lowercase alphabet).
• Double-letter monads should start with Æ or Œ.
  • Examples: ÆS (sine), Œ! (all permutations).
• Double-letter dyads should start with æ or œ.
  • Examples: æ« (bit shift left), œc (combinations without replacement).

(The Æ/æ atoms tend have a more “numerical” nature; the Œ/œ ones are for list operations. Æ and Œ were chosen to mean “algebraic/arithmetic extensions” and “other extensions”, respectively.)

Quicks

• Non-Latin letters, or Latin letters with unusual modifiers (cedilla, tilde, …) represent quicks. Their case hints at the result’s arity.
  • Example: ß (recurse), ç (last link as dyad).
• Double-letter quicks should start with Ð.
  • Example: Ðf (keep all elements satisfying a condition).

Custom atoms

• Custom atoms added by me (@GolfingSuccess) are 2 bytes in length and start with ƒ.
• Example: ƒB (check if palindrome), ƒR (inclusive prime range from x to y).