SOURCE

function Animal (){
   
}
Animal.prototype.run = function(){
    console.log("running")
}
Animal.prototype.eat =function(){
    console.log("eating")
}
Animal.prototype.name="animal"


const cat = new Animal();

console.log(cat.run())
console.log(cat.name)
console.log(cat.__proto__)
console.log(cat.__proto__.__proto__)