Javascript

Question 1

teste

Answer 1

123131

Question 2

adasdsad

Answer 2

asdada

Question 3

Define JavaScript.

Answer 3

A high-level, dynamic programming language primarily used for web development.

Question 4

True or false: JavaScript is a compiled language.

Answer 4

FALSE

JavaScript is an interpreted language, executed by the browser.

Question 5

What does DOM stand for?

Answer 5

Document Object Model, a programming interface for web documents.

Question 6

Fill in the blank: JavaScript is often used to create _______ websites.

Answer 6

Interactive

Question 7

What is a closure in JavaScript?

Answer 7

A function that retains access to its lexical scope, even when executed outside that scope.

Question 8

Define callback function.

Answer 8

A function passed as an argument to another function, executed after some operation.

Question 9

What does JSON stand for?

Answer 9

JavaScript Object Notation, a lightweight data interchange format.

Question 10

True or false: var is block-scoped.

Answer 10

FALSE

Variables declared with var are function-scoped.

Question 11

What is the purpose of ‘use strict’?

Answer 11

To enforce stricter parsing and error handling in JavaScript code.

Question 12

Fill in the blank: Promises are used for _______ in JavaScript.

Answer 12

Asynchronous programming

Question 13

Define hoisting.

Answer 13

JavaScript’s behavior of moving variable and function declarations to the top of their scope.

Question 14

What is an event listener?

Answer 14

A function that waits for a specific event to occur on a target element.

Question 15

True or false: let allows variable redeclaration.

Answer 15

FALSE

Variables declared with let cannot be redeclared in the same scope.

Question 16

What is the this keyword?

Answer 16

A reference to the current object in context, depending on how a function is called.

Question 17

Fill in the blank: Arrow functions do not have their own _______.

Answer 17

this context

Question 18

Define async/await.

Answer 18

Syntax for handling asynchronous operations more easily, built on Promises.

Question 19

What is a module in JavaScript?

Answer 19

A reusable piece of code that encapsulates functionality and can be imported/exported.

Question 20

True or false: JavaScript supports multiple inheritance.

Answer 20

FALSE

JavaScript uses prototype-based inheritance.

Question 21

What is localStorage?

Answer 21

A web storage feature that allows storing key-value pairs in a web browser.

Question 22

Fill in the blank: Template literals are enclosed by _______.

Answer 22

Backticks (`)

Question 23

Define event delegation.

Answer 23

A technique that allows a single event listener to manage events for multiple child elements.

Question 24

What is a synchronous operation?

Answer 24

An operation that blocks execution until it completes.

Question 25

True or false: **NaN** stands for 'Not a Number'.

Answer 25

TRUE

Question 26

What does **AJAX** stand for?

Answer 26

**Asynchronous JavaScript and XML**, a technique for creating asynchronous web applications.

Question 27

Fill in the blank: **JavaScript** can be used on both the _______ and client-side.

Answer 27

Server

Question 28

Define **prototype**.

Answer 28

An object from which other objects inherit properties and methods.