Opal (programming language)
{{About|the functional programming language|the Ruby interpreter|Ruby (programming language)#Alternative implementations}}
{{Use dmy dates|date=June 2022|cs1-dates=y}}
OPAL (OPtimized Applicative Language){{cite web | website=TU-Berlin/opal - Optimized Applicative Language |title=Opal| url=https://github.com/TU-Berlin/opal | access-date=23 September 2023}} is a functional programming language first developed at Technische Universität Berlin.
There is a later framework for static code analysis also called Opal.{{cite web | website=OPAL Project|title=Home page| url=https://www.opal-project.de/ | access-date=25 November 2023}}
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
{{Reflist}}
External links
- [https://web.archive.org/web/20170823091221/http://projects.uebb.tu-berlin.de/opal/trac The OPAL Home Page], archived, last modified 30 September 2010.
- [https://web.archive.org/web/20120426022221/http://projects.uebb.tu-berlin.de/opal/trac/wiki/InstallationEnglish OPAL Installation Guide], archived.
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