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Control Flow

This section covers the questions for Control Flow to clear all your concepts.

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Question 1

Which of the following is NOT a valid conditional statement in JavaScript?

if
else if
switch
elseif

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Question 2

Which loop always executes at least once, even if the condition is false?

for
while
do...while
for...in

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Question 3

What is the role of break keyword inside a loop?

Restart the loop
Move out of the loop
Ignore the rest of the statements below it and continue the loop
None of the above

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Question 4

What will the following code output?

JavaScript

for (let i = 0; i < 3; i++) {
    if (i === 1) break;
    console.log(i);
}

0, 1, 2
0
1
0, 1

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Question 5

What will be the output of the following code snippet?

JavaScript

let data = 7
while(data>=0){
    if (data<=5){
        data--;
        continue;
    }
    console.log(data);
    data--;
}

7 6 5 4 3 2 1 0
7 6 5
7 6
0 1 2 3 4 5

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Question 6

What will be the output for the following code snippet?

JavaScript

let i = 5;
while (true) {
    console.log(i);
    i += 5;
    if (i > 30) {
        break;
    }
}

Infinite loop
5 10 15 20 25 30
5 10 15 20 25
5 10 15 20 25 30 35

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Question 7

What is the purpose of the 'continue' statement in a loop?

To exit the loop completely
To skip the rest of the code and proceed with the next iteration
To pause the loop temporarily
To repeat the current iteration

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Question 8

What is the purpose of the try block in JavaScript?

To define a block of code to test for errors
To throw an error
To handle errors that cannot be caught
To execute code after an error

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Question 9

Which statement is used to throw a custom error in JavaScript?

throw
error
catch
raise

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Question 10

What is the correct syntax for labeling a loop in JavaScript?

labelName: for(...) {}
for labelName: {}
loop: {...}
label: { for(...) }

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Tags:

JavaScript

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