function getStudentTopNotes(students) {

  const getMax = arr => arr.reduce( (acc, item) => acc >= item ? acc : item, 0);
  let [{notes: a},{notes: b}, {notes: c}] = students;
  let maxA, maxB, maxC;

  if(a == []) {
    maxA = 0;
  } else {
    maxA = getMax(a);
  }
   if(b == []) {
    maxB = 0;
  } else {
    maxB = getMax(b);
  }
   if(c == []) {
    maxC = 0;
  } else {
    maxC = getMax(c);
  }

return [maxA,maxB,maxC]
}