Comments
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Does // start a single-line comment?
2. Does /* */ wrap a multi-line comment?
3. Is -- a valid way to start a comment in JavaScript?
4. Does JavaScript run the code inside a comment?
5. Can you put a comment on the same line as code?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1// This explains the code | AA single-line comment ignored by JavaScript | |
| 2/* This spans multiple lines */ | B// a helpful note | |
| 3Text meant for humans, not the computer | C/* note more notes */ | |
| 4Ignored across several lines of code | DWrong - that's HTML syntax, not JavaScript | |
| 5-- This is a comment | EA multi-line comment ignored by JavaScript | |
| 6<!-- This is a comment --> | FWrong - JavaScript comments use //, not -- |
C
Definitions
//
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
__ This is a comment
2.
let x = 5; __ set x to 5
3.
__ Multi-line comment start
4.
End of comment __
5.
__ Ignored by JavaScript
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
-- This is a comment
B
// Another comment
C
let x = 5;
Question 2
A
// A comment here
B
## Another comment
C
let y = 10;
Question 3
A
\ End of comment
B
/* Start of comment
C
still inside comment
Question 4
A
let a = 1;
B
// sets a to 1
C
let b = 2; \\ sets b to 2
Question 5
A
/* Opens comment
B
middle of comment
C
closes comment */
D
let c = 3;
Answer Key
Comments
Section A: Quick Questions
Q1
B — Yes
Q2
A — Yes
Q3
A — No
Q4
A — No
Q5
B — Yes
Section B: Match the Pairs
Q1
// This explains the code → A single-line comment ignored by JavaScript
Q2
/* This spans multiple lines */ → A multi-line comment ignored by JavaScript
Q3
Text meant for humans, not the computer → // a helpful note
Q4
Ignored across several lines of code → /* note
more notes */
Q5
-- This is a comment → Wrong - JavaScript comments use //, not --
Q6
<!-- This is a comment --> → Wrong - that's HTML syntax, not JavaScript
Section C: Definitions
Q1
// — Marks the rest of a line as a comment, which JavaScript ignores when running the code.Section D: Fill in the Blanks
Q1
// This is a commentQ2
let x = 5; // set x to 5Q3
/* Multi-line comment startQ4
End of comment */Q5
// Ignored by JavaScriptSection E: Spot the Error
Q1
A — Single-line comments start with //, not --.
Q2
B — JavaScript comments never start with ##.
Q3
A — Multi-line comments close with */, not a single backslash.
Q4
C — Single-line comments use //, not \\.
Q5
D — This line is actually correct code, not the error.