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

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

Example program

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

1. "Opal". TU-Berlin/opal - Optimized Applicative Language. Retrieved 2023-09-23.
2. "Home page". OPAL Project. Retrieved 2023-11-25.

External links

• The OPAL Home Page, archived, last modified 30 September 2010.
• OPAL Installation Guide, archived.

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