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JavaScript Comments Mocktest

Question - 14

Home
JavaScript
JavaScript Syntax
JavaScript Comments
Mocktest

1.

Which symbol is used for single-line comments in JavaScript?

A). // B). /* */ C). D). ##

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

The '//' symbol is used for single-line comments in JavaScript.

2.

How are multi-line comments denoted in JavaScript?

A). // B). /* */ C). D). ##

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option B

Solution:

Multi-line comments in JavaScript are denoted by '/* */'.

3.

Which type of comments are not executed by the JavaScript engine?

A). Single-line comments B). Multi-line comments C). Both D). None of the above

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option C

Solution:

Both single-line and multi-line comments are not executed by the JavaScript engine.

4.

What is the purpose of comments in JavaScript?

A). Documenting code B). Adding debugging statements C). Explaining code logic D). All of the above

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option D

Solution:

Comments in JavaScript serve multiple purposes, including documenting code, adding debugging statements, and explaining code logic.

5.

Which type of comment is suitable for longer explanations or notes?

A). Single-line comments B). Multi-line comments C). Both D). None of the above

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option B

Solution:

Multi-line comments are suitable for longer explanations or notes within the code.

6.

What should be avoided when writing comments in JavaScript?

A). Clarity B). Conciseness C). Redundancy D). Grammar

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option C

Solution:

Avoid redundancy in comments to maintain clarity and conciseness.

7.

How can you temporarily disable a block of code in JavaScript?

A). Using single-line comments B). Using multi-line comments C). Both D). None of the above

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option C

Solution:

You can temporarily disable a block of code in JavaScript by commenting it using single-line or multi-line comments.

8.

Which of the following is NOT a good practice for writing comments?

A). Updating comments as code evolves B). Using comments for deprecated code C). Writing comments for self-explanatory code D). Adding excessive comments

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option D

Solution:

Adding excessive comments can clutter the code and make it harder to read.

9.

What is the purpose of using comments for debugging?

A). To add debugging tools B). To disable code temporarily C). To isolate issues D). None of the above

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option C

Solution:

Comments for debugging help isolate issues and understand code behavior during debugging.

10.

Which type of comment is commonly used for TODO notes or future enhancements?

A). Single-line comments B). Multi-line comments C). Both D). None of the above

Answer & Solution Discuss in Board

Answer & Solution

Answer: Option A

Solution:

Single-line comments are often used for TODO notes or future enhancements in the code.

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