codility.js

//taks 3
//http://pasteboard.co/2DY4NjCM.png
// damn...

function isHeavy(i) {
  var sum = 0, len = 0, num = i;
  while (num > 0) {
    sum = sum + num % 10;
    num = num - num % 10;
    num = num / 10;
    len++;
  }
  return sum/len > 7;
}

function solution(A, B) {
  var count = 0;
  for (var i = A; i <= B; i++) {
    if (isHeavy(i)) {
      count++;
    }
  }
  return count;
}
console.log(solution(8675,8689));
//5