دنیای جاوااسکریپت ۵ - Prototypes

let pizza = {};
console.log(pizza.taste); // "pineapple"

let human = {
  teeth: 32
};
 
let gwen = {
  age: 19
};

console.log(gwen.teeth); // undefined

let human = {
  teeth: 32
};
 
let gwen = {
  // We added this line:
  // "Look for other properties here"
  __proto__: human,
  age: 19
};

console.log(gwen.teeth); // 32

let mammal = {
  brainy: true,
};
 
let human = {
  __proto__: mammal,
  teeth: 32
};
 
let gwen = {
  __proto__: human,
  age: 19
};
 
console.log(gwen.brainy); // true

console.log(gwen.hasOwnProperty('brainy')); // false
console.log(mammal.hasOwnProperty('brainy')); // true

let obj = {};

let obj = {};
console.log(obj.__proto__); // Play with it!

let weirdo = {
  __proto__: null
};
console.log(weirdo.hasOwnProperty); // undefined
console.log(weirdo.toString); // undefined

let obj = {};
obj.__proto__.smell = 'banana';

console.log(sherlock.smell); // "banana"
console.log(watson.smell); // "banana"