text: var School = function() {
    "use strict";
  
    var roster = {};
  
    function getRoster() {
      return roster;
    }
  
    function setRoster(name, grade) {
      if (roster[grade]) {
        roster[grade].push(name);
        roster[grade].sort();
      } else {
        roster[grade] = [name];
      }
    }
  
    function grade(grade) {
      if (roster[grade]) {
        return roster[grade];
      } else {
        return [];
      }
    }
  
    return {
      roster: getRoster,
      add: setRoster,
      grade: grade
    };
  };
  
  module.exports = School;
  