Check for conventions in programming challenges

[Elfoslav]

Some people do not write code according to conventions. It should throw an error if the code is not according to conventions. Force people to write nice code!

[Elfoslav]

For example this is ugly code that one student wrote:

var c = ['*'];
for (var i=0; i<20; i++) {
  console.log(c);
  c= c + ('*');
  i++;
}