weasel.js

target = "Juliet is the female protagonist and one of two title characters in William Shakespeare's romantic love tragedy Romeo and Juliet, the other being Romeo.".toUpperCase();

chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ',. ".split("");

function R(n) { return Math.floor(n*Math.random()); }

function getChar() {
return chars[R(chars.length)];
}

function getRandomString(){
var string = "";
for (var x = 0;x<target.length;x++){
string+=getChar();
}
return string;
}

function mutateString(s){
var t = s.split("");
for (var x=0;x<t.length;x++)
if (Math.random() < mutationRate)
t[x]=getChar();
return t.join("");
}

function fitness(str){ //number of matches
var score = 0;
for (var x = 0;x<target.length;x++){
if (str[x]==target[x]){
score++;
}
}
return score;
}

function init(){
for (var x=0;x<size;x++)
population.push({str:getRandomString()});
}

function main(){
init();
var beststring;
while (true){
population.forEach(function (y) { y.fitness = fitness(y.str); });
population.sort(function (a,b) { return b.fitness-a.fitness; });
beststring = population[0];
//console.log(population);
console.log(beststring.str + "; generation: "+generation+" fitness: "+beststring.fitness);
if (beststring.str == target)
return;
population = [beststring];
for (var x=1;x<size;x++)
population.push({str:mutateString(beststring.str)});
generation++;
}
}

var population = [];
var size = 50;
var generation = 0;
var mutationRate = 0.05;
main();

>>7
Its kinda primitive for a genetic algorithm, its just randomizes letters and compares them to a fixed string, so eventually it just stumbles on correct letters. I bet however Mentifex would claim this is AI-built literature and artificial Shakespeare-in-a-box.