JavaScript Comments Mocktest
Question - 20
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JavaScript Comments
JavaScript Comments
Mocktest
11.
Which of the following is true about multi-line comments?
A).
They can contain other multi-line comments
B).
They cannot be used to comment out code
C).
They can span multiple lines
D).
They must be at the beginning of the code
Answer & Solution
Discuss in Board
Answer & Solution
Answer:
Option They can span multiple lines
Solution:
Multi-line comments can span multiple lines.
12.
Why should comments be kept up-to-date with the code?
A).
To ensure they do not cause syntax errors
B).
To prevent the code from running
C).
To make the code easier to understand for others
D).
To increase code execution speed
Answer & Solution
Discuss in Board
Answer & Solution
Answer:
Option To make the code easier to understand for others
Solution:
Up-to-date comments help other developers understand the current functionality of the code.
13.
How do you write a comment that explains the purpose of a function in JavaScript?
A).
Inside the function body
B).
Before the function definition
C).
After the function definition
D).
It is not necessary to comment functions
Answer & Solution
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Answer & Solution
Answer:
Option Before the function definition
Solution:
Comments explaining a function's purpose are typically placed before the function definition.
14.
What happens if you include a comment within a string in JavaScript?
A).
The comment will be executed as code
B).
The comment will be ignored by the interpreter
C).
The comment will be treated as part of the string
D).
It will cause a syntax error
Answer & Solution
Discuss in Board
Answer & Solution
Answer:
Option The comment will be treated as part of the string
Solution:
Comments within a string are treated as part of the string and will not be ignored.
15.
Which of the following is NOT a benefit of using comments in JavaScript code?
A).
Improved code readability
B).
Easier debugging
C).
Faster code execution
D).
Better documentation
Answer & Solution
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Answer & Solution
Answer:
Option Faster code execution
Solution:
Comments do not affect the execution speed of the code; they are ignored during execution.
16.
How can you temporarily disable a piece of code without deleting it?
A).
By commenting it out using /* */ or //
B).
By placing it in a string
C).
By removing it from the file
D).
By placing it in a function
Answer & Solution
Discuss in Board
Answer & Solution
Answer:
Option By commenting it out using /* */ or //
Solution:
Commenting out code temporarily disables it without removing it from the file.
17.
What is the syntax for writing an inline comment in JavaScript?
A).
# This is an inline comment
B).
// This is an inline comment
C).
/* This is an inline comment */
D).
Answer & Solution
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Answer & Solution
Answer:
Option // This is an inline comment
Solution:
Inline comments in JavaScript are written using //.
18.
Can you use comments to include documentation for functions and variables in JavaScript?
A).
Yes
B).
No
C).
Only for functions
D).
Only for variables
Answer & Solution
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Answer & Solution
Answer:
Option Yes
Solution:
Comments can be used to document both functions and variables in JavaScript.
19.
Which of the following comments will result in an error if placed inside a JavaScript function?
A).
// This is a comment
B).
/* This is a comment */
C).
D).
# This is a comment
Answer & Solution
Discuss in Board
Answer & Solution
Answer:
Option
Solution: