// The constructor for our 'Lecture'
  // Takes two strings, name and teacher
  function Lecture( name, teacher ) {
      // Save them as local properties of the object
      this.name = name;
      this.teacher = teacher;
  }
  
  // A method of the Lecture class, used to generate
  // a string that can be used to display Lecture information
  Lecture.prototype.display = function(){
      return this.teacher + " is teaching " + this.name;
  };
  
  // A Schedule constructor that takes in an
  // array of lectures
  function Schedule( lectures ) {
      this.lectures = lectures;
  }
  
  // A method for constructing a string representing
  // a Schedule of Lectures
  Schedule.prototype.display = function(){
      var str = "";
  
      // Go through each of the lectures, building up
      // a string of information
      for ( var i = 0; i < this.lectures.length; i++ )
          str += this.lectures[i].display() + " ";
  
      return str;
  };