Opal is an actively used programming language created in 1994. OPAL (OPtimized Applicative Language) is a functional programming language first developed at the Technical University of Berlin.. Read more on Wikipedia...

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  • Opal ranks in the top 20% of languages
  • the Opal wikipedia page
  • Opal on github
  • Opal first appeared in 1994
  • file extensions for Opal include opal
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Example code from Linguist:

-- Deepak Chopra nonsense text generator
-- see https://github.com/StoneCypher/DeepakChopra_Opal/

starts = ["Experiential truth ", "The physical world ", "Non-judgment ", "Quantum physics "]
middles = ["nurtures an ", "projects onto ", "imparts reality to ", "constructs with "]
qualifiers = ["abundance of ", "the barrier of ", "self-righteous ", "potential "]
finishes = ["marvel.", "choices.", "creativity.", "actions."]

alert starts.sample + middles.sample + qualifiers.sample + finishes.sample

Example code from Wikipedia:

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

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Last updated December 10th, 2019

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