Opal (programming language)

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This article is about the functional programming language. For the Ruby interpreter, see Ruby (programming language) § Alternative implementations.

OPAL (OPtimized Applicative Language)[1] is a functional programming language first developed at Technische Universität Berlin.


There is a later framework for static code analysis also called Opal.[2]

Example program

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This is an example OPAL program, which calculates the GCD recursively.

Signature file (declaration)
   SIGNATURE GCD
   FUN GCD: nat ** nat -> nat
Implementation file (definition)
   IMPLEMENTATION GCD
   IMPORT Nat COMPLETELY
   DEF GCD(a,b) == IF a % b = 0 THEN b
                       ELSE IF a-b < b THEN GCD(b,a-b)
                           ELSE GCD(a-b,b)
                       FI
                   FI

References

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  1. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
  2. ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
[edit | edit source]


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