JavaScript Quiz - Level 4

1. What is the prototype chain used for in JavaScript?

Memory optimization

Inheritance of properties and methods

Data binding between objects

Automatic event listening

true

false

undefined

Error

It executes asynchronous callbacks before synchronous code

It handles asynchronous callbacks after the main call stack is empty

It only runs synchronous code

It runs JavaScript on multiple threads

To create unique property keys

To create private variables

To store debugging information

To improve performance

Implement the [Symbol.iterator]() method

Use a for loop on the object

Add a map() method to the object

Spread the object into an array

Logs 5 and returns a Promise

Logs 5 and returns undefined

Returns a Promise without logging

Throws an error

Calls the constructor or methods of the parent class

Accesses the global scope

Binds "this" to the parent object

Only works with extends keyword but not for method calls

['h','e','l','l','o']

'hello'

Error

undefined

A function that runs asynchronously

A function that can pause execution and resume later

A function that creates other functions

A recursive function