factoryfn.js

class Dog {
  constructor() {
    this.name = "woof";
  }

  bark() {
    console.log(this.name)
  }
}
var dd = new Dog()
dd.bark();

$('button').click(dd.bark)
// does not work
$('button').click(dd.bark.bind(dd))
// works
$('button').click(()=>dd.bark())
// works using arrow function

// so instead of creating objects, create  factories
const Dog1 = ()=>{
  const name = "woof";

  return {
    bark: ()=>console.log(this.name)
  }
}

const sniff = Dog1();
sniff.bark(); //works
$('button').click(sniff.bark)

proto.js

// creating object
// let animal = {};
// animal.name = "duster";
// animal.energy = "10";

// animal.bark = function(en) {
//   console.log('yessssss', this.name);
//   this.energy = this.energy + en;
// }

// animal.play = function(pl) {
//   this.energy -= pl;
// }

// animal.play(10);

// functional intantiation

// function Animal(name, energy) {
//   let animal = {};
//   animal.name = name;
//   animal.energy = energy;

//   animal.bark = function(en) {
//     console.log('yessssss', this.name);
//     this.energy = this.energy + en;
//   }

//   animal.play = function(pl) {
//     this.energy -= pl;
//   }
//   return animal;
// }

// const leo = Animal('Leo', 20);

// functional intantiation with shared methods
// let animalMds = {
//   bark(en) {
//     console.log('yessssss', this.name);
//     this.energy = this.energy + en;
//   },

//   play(pl) {
//     this.energy -= pl;
//   }
// }

// function Animal(name, energy) {
//   let animal = {};
//   animal.name = name;
//   animal.energy = energy;
//   animal.play = animalMds.play;
//   animal.bark = animalMds.bark;

//   return animal;
// }

// const leo1 = Animal('Leo', 25);
// leo1.play(55);


const parent = {
  name: 'arun',
  age: 27
}

const child = Object.create(parent);
child.name = "kumar";

console.log('chi',child.name);
console.log('chi',child.age);


// functional intantiation with shared methods
const animalMds = {
  bark(en) {
    console.log('yessssss', this.name);
    this.energy = this.energy + en;
  },

  play(pl) {
    this.energy -= pl;
  }
}

function Animal(name, energy) {
  let animal = Object.create(animalMds);
  animal.name = name;
  animal.energy = energy;
  
  return animal;
}

const snoop = Animal('snoop', 25);
snoop.play(55);