index.html

    function selectRandParent(tFit) {
      let randVal = tFit * random() // Random value between (0, tFit)
      let count = 0 // Cumulitive Fitness
      
      for(let i = 0; i < cars.length; i++) {
          count += cars[i].fitness
          if(randVal <= count) {
            return i
          }
      }
    }