User:Dan Bron/JnJ

J in J

Or, "Another Implementation of J", as contrasted with "An Implementation of J".

Public J Source Code

• Essays/Incunabulum
• Early J Source
• Open J, Oleg Kobchenko and Andrew Nikitin's J reimplementation project.
• Redick, TerrenceBrannon's J reimplementation project. I think he's changed foundation languages a couple times (first Lisp, then Chicken Scheme, now Java?). The source was originally at redick.metaperl.com but now appears to be hosted at GoogleCode.
• RATAPL.ARC was, I believe, an early (pre-J) implementation of "Rational APL" (aka Dictionary APL).

Commentary on Implementing J

• APL87
• A thread on reimplementing J. See Roger's comments in particular
• Roger's comments from an earlier thread on the Forum
  • Essential components of a J implementation
  • Implementation of transpose
• Roger notes the the test script suite specifies the language even more precisely then the DoJ. So, here are some test scripts he's posted:
• Some test script utilities
• Test script for factorial

Resources for Reimplementing J

• The Dictionary of J, of course.
• Monad ;: (lexing, word formation)
• Using J to parse
• Tracing J execution
• PrimitivePrimitives (the Vocabulary)
• Parser for J's rich numeric constant notation
• Other models of primitives
  • J model of rank a key component of any J implementation
  • J model of transpose
  • J model of key
  • J model of A.
  • J model of CRC
• Named nound internals
• Martin Gaertner's Juggle contains some interface information