JavaScript Control Flow Quiz

Test your understanding of Javascript Control Flow

JavaScript Quiz #07 - Understanding Control Flow in JavaScript

Let's explore the different control flow statements in JavaScript and test the understanding with a quiz.

5 mins read

1. What is the output?

for (let i = 0; i <= 5; i++) {
   if (i === 3) {
     continue;
   }
   console.log(i);
 }

0 1 2 3 4 5

0 1 2 4 5

0 1 2 4

0 1 2 3 4

2. What is the output?

let i = 0;
 do {
   console.log(i);
   i++;
 } while (i < 3);

0 1 2

0 1

0 1 2 3

1 2

3. What is the output?

const value = null || "Default";
 console.log(value);

null

Default

true

false

4. What is the output?

 let num = 5;
 const result = num && "Value exists";
 console.log(result);

Value exists

true

false

5. What is the output?

 let num = 3;
 while (num > 0) {
   console.log(num);
   num -= 2;
 }

3 1

3 0

3 2 1

6. What is the output?

 const value = "" || 0 || false || "Fallback";
 console.log(value);

" "

false

Fallback

7. What is the output?

const a = 5;
 
 function foo() {
   if (a === 5) {
     let a = 10;
   }
   console.log(a);
 }
 
 foo();

undefined

8. What is the output?

let x = 0;
 while (x < 10) {
   if (x === 5) {
     break;
   }
   x++;
 }
 console.log(x);

9. What is the output?

let x = 2;
 let result = '';
 switch (x) {
   case 1:
     result += 'A';
   case 2:
     result += 'B';
   case 3:
     result += 'C';
   default:
     result += 'D';
 }
 console.log(result);

ABC

BCD