Question

For example in classic object oriented programming I might have a class School which has an array of String representing students (not the ideal data structure but for illustration purposes only). It might look something like this

class School {
    String name;
    String[] students;
}

I could then instantiate a bunch of different schools each with a different name and different students. How does this concept translate across to Node.js? If I had a School module than a single instance is shared across the entire application. My initial thought is to represent each school as JSON object and basically pass around JSON where I would normally be passing around an instance of School. Is this the right idea and are there alternative approaches?

Answer 1

constructors and instances:

function School(name, students) {
  this.name = name;
  this.students = students || [];
};
School.prototype.enroll = function (student) {
  if (!~this.students.indexOf(student)) {
    this.students.push(student);
  } else {
    throw new Error("Student '" + student + "' already enrolled in " + this.name);
  }
};
var s = new School("Lakewood");
console.log(s.name);
console.log(s.students);
s.enroll("Me");
console.log(s.students);