// The prototype chain can be longer:
let animal = {
eats: true,
walk() {
console.log('Animal walks');
}
};
let rabbit = {
runs: true,
__proto__: animal
};
let longEar = {
earlenght: 100,
__proto__: rabbit
};
// Will get an error if we try to assign __proto__ in a circle.
// The value of __proto__ can be either an object or null. Other types are ignored.
// console.log(rabbit) // { runs: true }
// console.log(rabbit.eats) // true
// longEar.walk() // Animal walks
// console.log(longEar.runs) // true
// console.log(longEar.eats) // true
let user = {
name: "John",
surname: 'Doe',
get fullName() {
return `${this.name} ${this.surname}`;
},
set fullName(val) {
[this.name, this.surname] = val.split(' ');
}
};
let admin = {
isAdmin: true,
__proto__: user
};
// console.log(admin.fullName) // John Doe
admin.fullName = 'Vik Steps'; // setter triggers!
// console.log(admin.fullName) // Vik Steps <- state of admin modified
// console.log(admin.isAdmin) // true
// console.log(user.fullName) // John Doe <- state of user protected
// === TASKS ====
// What will be in console ?
let anim = {
jumps: null
};
let rabb = {
__proto__: anim,
jumps: true
};
console.log('task', rabb.jumps); // ? (1)
delete rabb.jumps;
console.log('task', rabb.jumps); // ? (2)
delete anim.jumps;
console.log('task', rabb.jumps); // ? (3)
/// https://javascript.info/prototype-inheritance