Modern JavaScript Essentials

Easy Knowledge Check · Real-World Development

Quiz 01 · Easy

Write Safer, Cleaner, Smarter JavaScript

Check your understanding of modern ES6+ essentials used in real-world applications.

Format

10 Questions · 10 Points

True / False

Multiple Choice

Easy

Difficulty Level

Part A — True / False

QUESTION 1

Use `const` when a variable reference should not be reassigned.

True False

QUESTION 2

`let` should never be used when a value needs to change later.

True False

QUESTION 3

Template literals can embed values inside text using `${...}`.

True False

QUESTION 4

The spread operator `...` can be used to copy an array.

True False

QUESTION 5

Optional chaining `?.` is mainly used to force an error when a nested property is missing.

True False

Part B — Multiple Choice

QUESTION 6

Which syntax represents an arrow function?

A. function -> {} B. () => {} C. () := {} D. func() {}

QUESTION 7

What is a common purpose of destructuring?

A. Delete a JavaScript file B. Reload a web server C. Extract values into variables D. Convert JavaScript into CSS

QUESTION 8

What is the main benefit of a default parameter?

A. Provide a fallback value B. Create a database C. Style an HTML element D. Rename a JavaScript file

QUESTION 9

Which operator provides a fallback when a value is `null` or `undefined`?

A. ++ B. === C. && D. ??

QUESTION 10

Which pair is used to share and reuse code with ES Modules?

A. open / close B. import / export C. read / write D. start / stop

Write Safer, Cleaner, Smarter JavaScript

Part A — True / False

Use const when a variable reference should not be reassigned.

let should never be used when a value needs to change later.

Template literals can embed values inside text using ${...}.

The spread operator ... can be used to copy an array.

Optional chaining ?. is mainly used to force an error when a nested property is missing.

Part B — Multiple Choice

Which syntax represents an arrow function?

What is a common purpose of destructuring?

What is the main benefit of a default parameter?

Which operator provides a fallback when a value is null or undefined?

Which pair is used to share and reuse code with ES Modules?

Use `const` when a variable reference should not be reassigned.

`let` should never be used when a value needs to change later.

Template literals can embed values inside text using `${...}`.

The spread operator `...` can be used to copy an array.

Optional chaining `?.` is mainly used to force an error when a nested property is missing.

Which operator provides a fallback when a value is `null` or `undefined`?