Operators and strings · Lesson 5 of 45

Arithmetic and assignment

Add, subtract, remainder and powers, plus += and ++.

7 minutes3 games

The basic operators are +, -, * and /. Two more are important:

% remainder: 17 % 5 is 2. Very handy: n % 2 === 0 means n is even.
** power: 2 ** 10 is 1024.

Precedence follows maths: multiply and divide before add and subtract, brackets before everything.

JavaScript

console.log(17 % 5)        // 2
console.log(2 ** 10)       // 1024
console.log(2 + 3 * 4)     // 14
console.log((2 + 3) * 4)   // 20
console.log(7 / 2)         // 3.5
console.log(Math.floor(7 / 2)) // 3

Assignment shortcuts

Step by step1 / 5

▶let likes = 9
2likes += 1
3likes *= 2
4likes++
5console.log(likes)

Variables

likes

Output

…

What's the output?

console.log(10 % 3)
console.log(2 + 2 * 2)

What will this code print?

Complete the code

Add price to total using the shortcut.

let total = 100
const price = 25
total  price

Exercise

Print how many minutes are in 3 hours and 20 minutes (200).

Expected output: 200

JavaScript

const hours = 3
const minutes = 20

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JavaScript

Operators and strings · Lesson 5 of 45

Arithmetic and assignment

Add, subtract, remainder and powers, plus += and ++.

7 minutes3 games

The basic operators are +, -, * and /. Two more are important:

% remainder: 17 % 5 is 2. Very handy: n % 2 === 0 means n is even.
** power: 2 ** 10 is 1024.

Precedence follows maths: multiply and divide before add and subtract, brackets before everything.

JavaScript

console.log(17 % 5)        // 2
console.log(2 ** 10)       // 1024
console.log(2 + 3 * 4)     // 14
console.log((2 + 3) * 4)   // 20
console.log(7 / 2)         // 3.5
console.log(Math.floor(7 / 2)) // 3

Assignment shortcuts

Step by step1 / 5

▶let likes = 9
2likes += 1
3likes *= 2
4likes++
5console.log(likes)

Variables

likes

Output

…

What's the output?

console.log(10 % 3)
console.log(2 + 2 * 2)

What will this code print?

Complete the code

Add price to total using the shortcut.

let total = 100
const price = 25
total  price

Exercise

Print how many minutes are in 3 hours and 20 minutes (200).

Expected output: 200

JavaScript

const hours = 3
const minutes = 20

Learn more from

Played 0 of 3 games