Assignment operators in Javascript - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this code using += operator?

Consider the following JavaScript code snippet. What will be printed to the console?

Javascript

let x = 5;
x += 3;
console.log(x);

A 5

B 8

C 3

D 53

💡 Hint

Remember that += adds the right value to the left variable.

The += operator adds the right value (3) to the left variable (5), so x becomes 8.

❓ Predict Output

intermediate

What is the output after using *= operator?

Look at this code. What will be the value of y after execution?

Javascript

let y = 4;
y *= 2;
console.log(y);

A 6

B 42

C 8

D 2

💡 Hint

The *= operator multiplies the variable by the right value.

y starts at 4, then y *= 2 multiplies it by 2, so y becomes 8.

❓ Predict Output

advanced

What is the output of this code using combined operators?

What will be printed to the console after running this code?

Javascript

let a = 10;
a -= 3;
a /= 7;
console.log(a.toFixed(2));

A 11

B 2

C 0

D 1.00

💡 Hint

Apply each operator step by step and then format the number.

a starts at 10, a -= 3 makes it 7, then a /= 7 makes it 1. toFixed(2) formats it as '1.00'.

❓ Predict Output

advanced

What is the output of this code using %= operator?

What will be the value of b after this code runs?

Javascript

let b = 15;
b %= 4;
console.log(b);

A 3

B 4

C 15

D 11

💡 Hint

The %= operator gives the remainder of division.

15 divided by 4 leaves a remainder of 3, so b becomes 3.

❓ Predict Output

expert

What is the output of this tricky assignment code?

What will be printed to the console after running this code?

Javascript

let c = 2;
let d = 3;
c *= d += 4;
console.log(c);

A 14

B 10

C 8

D 6

💡 Hint

Remember that d += 4 happens first, then c *= d.

d += 4 makes d = 7, then c *= 7 makes c = 14.