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Language peer sets for YERK:
United States
United States/1992
Designed 1992
1990s languages
Fifth generation
Post-Cold War


alternate simple view
Country: United States
Designed 1992
Published: 1992

named after the Yerkes Observatory, an OOL based on a FORTH kernel with some major modifications. Originally known as NEON, developed and sold as a product by Kriya Systems from 1985-89. Several people from University of Chicago have maintained YERK since it's demise as a product. Because of possible Trademark conflict, they named it YERK.

from Rodriguez & Poehlman:
Neon was a commercial OOF, modeled after Smalltalk; when released into the public domain it was renamed Yerk. The object is not executed; it is parsed by the message word, which invokes or compiles the method. Added data structures include: class definition header, class list, method list, method stack, and object stack. Objects are statically allocated, but dynamically allocated memory can be "cast" as objects.

Related languages
Neon YERK   Evolution of

  • Grehan, Rick. (1992) Grehan, Rick. "Yerk Comes to the PC." Forth Dimensions 13(5) (January- February 1992) pp.6-18
  • Bradford J. Rodriguez & W. F. S. Poehlman (1996) Bradford J. Rodriguez & W. F. S. Poehlman "A Survey of Object-Oriented Forths"
          in [SIGPLAN] (1996) SIGPLAN Notices 31(04) April 1996
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