77 lines
1.6 KiB
Plaintext
77 lines
1.6 KiB
Plaintext
import system'routines;
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import extensions;
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import extensions'text;
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const string Target = "METHINKS IT IS LIKE A WEASEL";
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const string AllowedCharacters = " ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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const int C = 100;
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const real P = 0.05r;
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rnd = randomGenerator;
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randomChar
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= AllowedCharacters[rnd.nextInt(AllowedCharacters.Length)];
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extension evoHelper
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{
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randomString()
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= 0.repeatTill(self).selectBy::(x => randomChar).summarize(new StringWriter());
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fitnessOf(s)
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= self.zipBy(s, (a,b => (a==b) ? 1 : 0)).summarize(new Integer()).toInt();
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mutate(p)
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= self.selectBy::(ch => (rnd.nextReal() <= p) ? randomChar : ch).summarize(new StringWriter());
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}
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class EvoAlgorithm : Enumerator
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{
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object _target;
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object? _current;
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object _variantCount;
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constructor new(s,count)
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{
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_target := s;
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_variantCount := count.toInt();
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}
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get Value() = _current;
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bool next()
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{
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if (nil == _current)
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{ _current := _target.Length.randomString(); ^ true };
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if (_target == _current)
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{ ^ false };
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auto variants := Array.allocate(_variantCount).populate::(x => _current.mutate(P) );
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_current := variants.sort::(a,b => a.fitnessOf(Target) > b.fitnessOf(Target) ).at(0);
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^ true
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}
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reset()
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{
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_current := nil
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}
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enumerable() => _target;
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}
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public program()
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{
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var attempt := new Integer();
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EvoAlgorithm.new(Target,C).forEach::(current)
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{
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Console
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.printPaddingLeft(10,"#",attempt.append(1))
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.printLine(" ",current," fitness: ",current.fitnessOf(Target))
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};
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Console.readChar()
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}
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