JavaScript Concepts and Runtime Quiz

What keyword is used to define a class in JavaScript?

• class

• function

• object

• prototype

What is the purpose of the constructor method in a class?

• To define static methods

• To initialize instance variables

• To create global variables

• To execute asynchronous tasks

Which keyword refers to the specific object being built in a class?

• this

• object

• instance

• self

What is the default value of the 'role' parameter in the User class constructor?

• admin

• user

• guest

• viewer

What does the term 'synchronous' mean in JavaScript?

• Execute tasks in sequence

• Execute tasks in parallel

• Execute tasks asynchronously

• Execute tasks randomly

What is the purpose of the 'setTimeout' function?

• To execute code synchronously

• To execute code after a delay

• To execute code immediately

• To execute code in parallel

What is a 'Promise' in JavaScript?

• A function that executes immediately

• A variable that holds a value

• A placeholder for a future result

• A method to handle synchronous tasks

Which variable declaration keyword is block-scoped and re-assignable?

• static

• var

• let

• const

What is the result of trying to reassign a 'const' variable?

• The value changes

• A syntax error occurs

• A type error occurs

• The program crashes

What is the purpose of the 'import' keyword?

• To create a new module

• To declare a variable

• To define a function

• To access functions or variables from other files