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Task/Evolutionary-algorithm/UTFool/evolutionary-algorithm.utfool

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+···
+http://rosettacode.org/wiki/Evolutionary_algorithm
+···
+■ Evolutionary
+  § static
+    target⦂ String: "METHINKS IT IS LIKE A WEASEL"
+    letter⦂ char[]: "ABCDEFGHIJKLMNOPQRSTUVWXYZ ".toCharArray°
+    parent⦂ String
+    random⦂ java.util.Random°
+    rate⦂ double: 0.5
+    C⦂ int: 1000
+
+    ▶ fittness⦂ int    · computes the 'closeness' of its
+    • argument⦂ String · to the target string
+      closeness⦂ int: 0
+      ∀ i ∈ 0 … target.length°
+        closeness◥ if target.charAt i = argument.charAt i
+      return closeness
+
+    ▶ mutate⦂ String · returns a copy of the
+    • given⦂ String  · with some characters probably mutated
+    • rate⦂ double
+      copy⦂ char[]: given.toCharArray°
+      ∀ i ∈ 0 … given.length°
+        copy[i]: letter[random.nextInt letter.length] if rate > random.nextDouble°
+      return String.valueOf copy
+
+    ▶ main
+    • args⦂ String[]
+      ancest⦂ StringBuilder°
+      ∀ i ∈ 0 … target.length°
+        ancest.append letter[random.nextInt letter.length]
+      parent: ancest.toString°
+      currentFittness⦂ int: fittness parent
+      generation⦂ int: 0
+      🔁 until the parent ≈ target
+        if fittness parent > currentFittness
+           currentFittness: fittness parent
+           System.out.println "Fittness of generation #⸨generation⸩ is ⸨currentFittness⸩"
+        for each time from 1 to C
+            mutation⦂ String: mutate parent, rate
+            parent: mutation if fittness parent < fittness mutation
+        generation◥
+      System.out.println "Target reached by generation #⸨generation⸩"