Arithmetic operators in Javascript - Interactive Code Practice

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 - instead of + will subtract instead of add.

The + operator adds two numbers together.

2fill in blank

medium

Complete the code to multiply two numbers and store the result in product.

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 + will add instead of multiply.

The * operator multiplies two numbers.

3fill in blank

hard

Fix the error in the code to correctly divide num1 by num2.

Javascript

let num1 = 20;
let num2 = 4;
let result = num1 [1] num2;

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

A+

B/

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using * multiplies instead of divides.

The / operator divides the first number by the second.

4fill in blank

hard

Fill both blanks to create an object that maps numbers to their squares only if the number is even.

Javascript

const squares = {n[1]2 for n in [1, 2, 3, 4, 5, 6] if n [2] 2 === 0};

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

A**

B%

C===

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using + instead of ** will add instead of square.

The ** operator raises a number to a power (square here). The % operator finds the remainder, used to check if a number is even.

5fill in blank

hard

Fill all three blanks to create an object mapping uppercase letters to their ASCII codes only if the code is greater than 65.

Javascript

const codes = {[[1]]: [2] for [3] of ['A', 'B', 'C', 'D'] if [2] > 65};

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

Aletter

Bletter.charCodeAt(0)

Dcode

Attempts:

3 left

💡 Hint

Common Mistakes

Using for ... in instead of for ... of will iterate keys, not values.

letter is the variable for each character. charCodeAt(0) gets the ASCII code. The loop uses for ... of to iterate over letters.