Defines a superclass named Person and subclass named Studenusing prototype chain

Inheritance.js

(function () {
  'use strict';

  function Person(name, age, gender) {
    this.name = name;
    this.age = age;
    this.gender = gender;
  }

  Person.prototype.getName = function () {
    return 'Name: ' + this.name.toString();
  };

  Person.prototype.getAge = function () {
    return 'Age: ' + this.age.toString();
  };

  Person.prototype.getGender = function () {
    return 'Gender: ' + this.gender.toString();
  };

  Person.prototype.getSummary = function () {
    return [this.getName(),
      this.getGender(),
      this.getAge()].join(',\n');
  };

  function Student(name, age, sex, grade, school) {
    Person.call(this, name, age, sex);
    this.grade = grade;
    this.school = school;
  }

  Student.prototype = Object.create(Person.prototype);

  Student.prototype.getGrade = function () {
    return 'Grade: ' + this.grade.toString();
  };

  Student.prototype.getSchool = function () {
    return 'School: ' + this.school.toString();
  };

  Student.prototype.getSummary = function () {
    return [this.getName(),
      this.getGender(),
      this.getAge(),
      this.getGrade(),
      this.getSchool()].join(',\n');
  };

  var person = new Person('Sachin Tendulkar',
    42,
    'Male');

  person.getSummary();
  //Name: Sachin Tendulkar,
  //Gender: Male,
  //Age: 42

  var student = new Student('Arjun Tendular',
    16,
    'Male',
    12,
    'Shardahram School');

 student.getSummary();
  // Name: Arjun Tendular,
  // Gender: Male,
  // Age: 16, Grade: 12, 
  // School: Shardahram School


}());