JavaScript Fundamentals: Scoping, Template Literals, and Arrow Functions Quiz

Variable Hoisting and Scoping (var, let, const)
Template Literals (using ${} for string interpolation)
Arrow Functions and the this Keyword

This quiz is designed to help you understand JavaScript variables, template literals, and arrow functions through real-world scenarios!

Question 1.

What will the following code output? console.log(x); var x = 10;

A.
10
B.
undefined
C.
ReferenceError
D.
null

Question 2.

What happens when you declare a variable with let and access it before initialization?

A.
Returns undefined
B.
Throws a ReferenceError
C.
Automatically assigns null
D.
It works fine

Question 3.

Which of the following is a correct use of template literals?

A.
My age is + age
B.
My age is ${}
C.
My age is ${age}
D.
"My age is " + age

Question 4.

What will the following code output? const name = "Alice"; console.log(`Hello, ${name}!`);

A.
Hello, Alice!
B.
Hello, ${name}!
C.
undefined
D.
Error

Question 5.

What is the behavior of this inside an arrow function?

A.
It refers to the global object
B.
It creates a new this
C.
It throws an error
D.
It refers to the enclosing lexical scope

Question 6.

What will the following code output? const obj = { name: "Bob", greet: () => console.log(`Hello, ${this.name}`) }; obj.greet();

A.
Hello, Bob
B.
Error
C.
Hello, undefined
D.
Hello, null

Question 7.

What will the following code do? try { console.log(5 / 0); } catch (err) { console.log("Error"); }

A.
Output Error
B.
Throws a runtime error
C.
Output Infinity
D.
Error in syntax

Question 8.

Which block is always executed in a try-catch-finally statement?

A.
try
B.
catch
C.
finally
D.
None of the above

Question 9.

What will the following code output? let x = 10; { let x = 20; console.log(x); } console.log(x);

A.
20, 20
B.
20, 10
C.
10, 20
D.
Error

Question 10.

What will happen if you reassign a const variable? const age = 25; age = 30; console.log(age);

A.
Outputs 30
B.
Outputs 25
C.
Throws a TypeError
D.
Outputs undefined