js_multi_inheritance_class.js

class Parent {
  constructor(father_name, mother_name, city_name) {
    this.father_name = father_name;
    this.mother_name = mother_name;
    this.city_name = city_name;
  }

  printParentDetails(){
    console.log('Father Name: ', this.father_name);
    console.log('Mother Name: ', this.mother_name);
    console.log('They live in: ', this.city_name)
  }
}

class Country {
  constructor(country_name, country_code) {
    this.country_name = country_name;
    this.country_code = country_code;
  }

  printCountryDetails() {
    console.log('Country Name: ', this.country_name);
    console.log('Country Code: ', this.country_code);
  }
}


class Child {
  constructor(father_name, mother_name,city_name, name, age, country_name, country_code) {
    extendClass(this, new Parent(father_name, mother_name,city_name));
    extendClass(this, new Country(country_name, country_code));
    this.name = name;
    this.age = age;
  }

  printChildDetails(){
      this.printParentDetails();
      console.log('Child name is: ', this.name);
      console.log('Child age is: ', this.age)
  }
}

function extendClass(child, parent) {
  for(let key in parent){
    child[key] = parent[key]
  }
  Reflect.ownKeys(Reflect.getPrototypeOf(parent)).filter(d=> d!= 'constructor').map(fun=>{if(!child[fun]) {child[fun] = parent.__proto__[fun].bind(child);}});
}


const child_1 = new Child('Jonny', 'Jolly', 'New York', 'Jin', 18);
const child_2 = new Child('Ram', 'Sham', 'Mumbai', 'Jadu', 21);

child_1.printChildDetails();
child_2.printChildDetails();

js_multi_inheritance_proto.js

const Parent = function(father_name, mother_name, city_name) {
  this.father_name = father_name;
  this.mother_name = mother_name;
  this.city_name = city_name;

  this.printParentDetails= ()=>{
    console.log('Father Name: ', this.father_name);
    console.log('Mother Name: ', this.mother_name);
    console.log('They live in: ', this.city_name);
  }
}

const Country = function(country_name, country_code) {
  this.country_name = country_name;
  this.country_code = country_code;

  this.printCountryDetails= ()=> {
    console.log('Country Name: ', this.country_name);
    console.log('Country Code: ', this.country_code);
  }
}


const Child = function(father_name, mother_name,city_name, name, age, country_name, country_code) {
  Parent.call(this,father_name,  mother_name, city_name);
  Country.call(this, country_name,country_code);
  this.name = name;
  this.age = age;

  this.printChildDetails = ()=>{
      this.printParentDetails();
      this.printCountryDetails();
      console.log('Child name is: ', this.name);
      console.log('Child age is: ', this.age);
  }
}

Child.prototype = Object.create(Parent.prototype);
Child.prototype = Object.create(Country.prototype);
Child.prototype.constructor = Child;


const child_1 = new Child('Jonny', 'Jolly', 'Washington', 'Jin', 18, 'US', '+1');
const child_2 = new Child('Ram', 'Sham', 'Mumbai', 'Jadu', 21, 'India', '+91');

child_1.printChildDetails();
child_2.printChildDetails();

js_simple_inheritance_class.js

class Parent {
  constructor(father_name, mother_name, city_name) {
    this.father_name = father_name;
    this.mother_name = mother_name;
    this.city_name = city_name;
  }

  printParentDetails(){
    console.log('Father Name: ', this.father_name);
    console.log('Mother Name: ', this.mother_name);
    console.log('They live in: ', this.city_name);
  }
}

class Child extends Parent{
  constructor(father_name, mother_name,city_name, name, age) {
    super(father_name,  mother_name, city_name);
    this.name = name;
    this.age = age;
  }

  printChildDetails(){
      this.printParentDetails();
      console.log('Child name is: ', this.name);
      console.log('Child age is: ', this.age);
  }
}


const child_1 = new Child('Jonny', 'Jolly', 'New York', 'Jin', 18);
const child_2 = new Child('Ram', 'Sham', 'Mumbai', 'Jadu', 21);

child_1.printChildDetails();
child_2.printChildDetails();

js_simple_inheritance_proto.js

const Parent = function(father_name, mother_name, city_name) {
  this.father_name = father_name;
  this.mother_name = mother_name;
  this.city_name = city_name;

  this.printParentDetails= ()=>{
    console.log('Father Name: ', this.father_name);
    console.log('Mother Name: ', this.mother_name);
    console.log('They live in: ', this.city_name);
  }
}

const Child = function(father_name, mother_name,city_name, name, age) {
  Parent.call(this,father_name,  mother_name, city_name);
  this.name = name;
  this.age = age;

  this.printChildDetails = ()=>{
      this.printParentDetails();
      console.log('Child name is: ', this.name);
      console.log('Child age is: ', this.age);
  }
}

Child.prototype = Object.create(Parent.prototype);
Child.prototype.constructor = Child;

const child_1 = new Child('Jonny', 'Jolly', 'New York', 'Jin', 18);
const child_2 = new Child('Ram', 'Sham', 'Mumbai', 'Jadu', 21);

child_1.printChildDetails();
child_2.printChildDetails();

Single and multiple inheritance in JavaScript using both prototype and class