Emerald (programming language)

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Designed byAndrew P. Black, Norman C. Hutchinson, Eric B. Jul, Henry M. Levy
First appeared1980s
Typing disciplinestrong, static
Influenced by
Pascal, Simula, Smalltalk
Java, Singularity

Emerald is a distributed, object-oriented programming language developed in the 1980s by Andrew P. Black, Norman C. Hutchinson, Eric B. Jul, and Henry M. Levy, in the Department of Computer Science at the University of Washington.[1]

A simple Emerald program can create an object and move it around the system:

const Kilroy ←  object Kilroy
  const origin ←  locate self
  const up ← origin.getActiveNodes
  for e in up
   const there ← e.getTheNode
   move self to there
  end for
  move self to origin
  end process
end Kilroy

Emerald was designed to support high performance distribution, location, and high performance of objects, to simplify distributed programming, to exploit information hiding, and to be a small language.


  1. ^ Black, Andrew P.; Hutchinson, Norman C.; Jul, Eric; Levy, Henry M. (1 January 2007). "The Development of the Emerald Programming Language". Proceedings of the third ACM SIGPLAN conference on History of programming languages - HOPL III. ACM. pp. 11–1–11-51. doi:10.1145/1238844.1238855. ISBN 978-1-59593-766-7.

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