Quiz

JavaScript Loops and Conditionals Quiz

8 questions on for, while, if/else, and switch — the basic logic for controlling how code runs.

questions

~4 min

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instant result

Question 1 of 8

How many times does for (let i = 0; i < 3; i++) run?

2 times✓✗ 3 times✓✗ 4 times✓✗ Infinitely✓✗

Question 2 of 8

What does break do inside a loop?

Skips the current iteration✓✗ Stops the loop entirely✓✗ Restarts the loop✓✗ Does nothing✓✗

Question 3 of 8

What does continue do inside a loop?

Stops the loop entirely✓✗ Skips the current iteration and moves to the next one✓✗ Doubles the counter✓✗ Throws an error✓✗

Question 4 of 8

How does while differ from for?

No difference✓✗ while runs as long as a condition is true, with no built-in counter✓✗ while always runs at least once✓✗ for can't be used with arrays✓✗

Question 5 of 8

When should you use switch instead of a chain of if/else?

Never, switch is outdated✓✗ When comparing one variable against several specific values✓✗ Only with numbers✓✗ Only inside functions✓✗

Question 6 of 8

What happens without a break inside a case in switch?

Nothing special✓✗ Execution "falls through" into the next case✓✗ An error occurs✓✗ The switch exits early✓✗

Question 7 of 8

What does Boolean(0) return?

true✓✗ false✓✗ undefined✓✗ An error✓✗

Question 8 of 8

Which loop is guaranteed to run at least once?

for✓✗ while✓✗ do...while✓✗ None of them✓✗

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