JS OOP

oop.js

function Subject(name, topics){
    this.name = name;
    this.topics = topics;
}

var subjectMath = new Subject("Maths", ["sets", "trigonomitry", "algebra"]);
var subjectScience = new Subject("Science", ["Biology", "Astronomy", "Physics"]);

function Person(gender, age, currentSubject, currentTopicIndex){
    this.gender = gender;
    this.age = age;
    this.currentSubject = currentSubject;
    this.currentTopicIndex = currentTopicIndex; 
    this.currentTopicName = this.currentSubject.topics[currentTopicIndex];
}

Person.prototype.describe = function () {
    console.log("person is " + this.gender + 
            ", age " + this.age + " and reading " +
            this.currentSubject.name + ' with topic ' + 
            this.currentTopicName);
}

var person1 = new Person("Male", 21, subjectMath,1);
var person2 = new Person("Female", 25,subjectMath,0);

person1.describe();
person2.describe();