gistfile1.txt

let solution = 'a'...'z'; // <- the end solution;

let currentSolution = 'z'...'a';

while (grade(currrentSolution) < '100%') {
  let generation = randomlyMutate(currentSolution, { times: 10 });
  let bestInGeneration = pickBestSolutionIn(generation);
  
  currentSolution = bestInGeneration;
}