Question

At the question 3 without using inheritance, how can I access to the both constructors, Student & Course with only one prototype method displayStudents to print out all of the both properties?

The JavaScript code defines a constructor function for a Student class.

1. Add a Course constructor function that takes a title as a parameter. The Course class should have 2 properties: a title and an array of students. The constructor function should initialize the title property to the title parameter and initialize the students array to an empty array.
2. Add a method to the constructor function called addStudent that takes a single student parameter. The addStudent()method should push the student to the back of the students array property.
3. Add a prototype method called displayStudents that takes no parameters. The displayStudents() method should output the course title and all students' names and GPAs to the console.
4. Instantiate 2 different courses with any titles, and add a few students (Student objects) to the courses using the addStudent() method.
5. Display all the students in the 2 courses using the displayStudents() method.

given:

function Student(name, gpa) {
this.name = name;
this.gpa = gpa;}

Answer 1

//=======Student.js=====================
class Student{
   constructor(name,GPA){
       this.name=name;
       this.GPA=GPA;
   }
   getName(){
       return this.name;
   }
   getGPA(){
       return this.GPA;
   }
   setName(name){
       this.name=name;
   }
   setGPA(GPA){
       this.GPA=GPA;
   }
}
//_____________________
class Course{
   constructor(title){
       this.title=title;
       this.total=0;
       this.StudentArray={};
   }
   getTitle(){
       return this.title;
   }
   addStudent(stud){
       this.StudentArray[this.total]=stud;
       this.total=this.total+1;
   }
   displayStudents(){
       var i;
       console.log(this.title);
       console.log("_____________")
       for(i=0;i<this.total;i++){
           console.log(this.StudentArray[i].getName());
           console.log(this.StudentArray[i].getGPA())
           console.log("--------------")
       }
       console.log("_____________")
   }
}
//_________________________

let C1=new Course("Java");
let s1=new Student("Tom",6.7);
let s2=new Student("Alice",8.7);
let s3=new Student("Ronnie",9.0);
C1.addStudent(s1);
C1.addStudent(s2);
C1.addStudent(s3);

C1.displayStudents();

let C2=new Course("Algorithm");
let s4=new Student("Mourice",6.88);
let s5=new Student("Anita",7.7);
let s6=new Student("Alite",9.6);
C2.addStudent(s4);
C2.addStudent(s5);
C2.addStudent(s6);

C2.displayStudents();

//===========end of Student.js==================
//output

C:\Program Files\nodejs\node.exe Student.js
Java
_____________
Tom
6.7
--------------
Alice
8.7
--------------
Ronnie
9
--------------
_____________
Algorithm
_____________
Mourice
6.88
--------------
Anita
7.7
--------------
Alite
9.6
--------------
_____________