Why operators are needed in Javascript - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to add two numbers and store the result in sum.

Javascript

let a = 5;
let b = 3;
let sum = a [1] b;

Drag options to blanks, or click blank then click option'

A*

B-

C/

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction - instead of addition +.

The + operator adds two numbers together.

2fill in blank

medium

Complete the code to check if age is greater than 18.

Javascript

let age = 20;
if (age [1] 18) {
  console.log('Adult');
}

Drag options to blanks, or click blank then click option'

A<

B>

C===

D<=

Attempts:

3 left

💡 Hint

Common Mistakes

Using less than < instead of greater than >.

The > operator checks if the left value is greater than the right value.

3fill in blank

hard

Fix the error in the code to multiply x and y.

Javascript

let x = 4;
let y = 7;
let product = x [1] y;

Drag options to blanks, or click blank then click option'

A*

B-

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition + or subtraction - instead of multiplication *.

The * operator multiplies two numbers.

4fill in blank

hard

Fill both blanks to create an object with keys as uppercase letters and values as numbers greater than 10.

Javascript

const data = {
  [1]: 15,
  [2]: 20
};

Drag options to blanks, or click blank then click option'

A'A'

B'b'

C'B'

D'a'

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase letters when uppercase is required.

Not using quotes around keys.

Keys in objects are strings. Using uppercase letters 'A' and 'B' as keys matches the requirement.

5fill in blank

hard

Fill both blanks to create a condition that checks if score is between 50 and 100 (inclusive).

Javascript

if (score [1] 50 && score [2] 100) {
  console.log('Pass');
} else {
  console.log('Fail');
}

Drag options to blanks, or click blank then click option'

A>=

B<=

C<

D>

Attempts:

3 left

💡 Hint

Common Mistakes

Using > or < without equals, missing boundary values.

The condition uses >= to check if score is at least 50 and <= to check if score is at most 100.