If we look at the following sum: 7 + 4 = 11

The + is the operator and the 7 and the 4 are the operands.

So the numbers are called operands and the operation (to be performed between the two operands) is defined by an operator.

In JavaScript we can use the following types of operators.

Arithmetic operators perform arithmetic on numbers. The main arithmetic operators are:

let answer = 4 + 5

let answer = 6 - 3

let answer = 2 * 7

let answer = 10 / 2

There are also some other arithmetic operators that we can use:

answer++

answer--

let answer = 8 % 3

Let's try using the arithmetic operators. Go to the https://makecode.microbit.org website, create a new project and switch from Blocks to JavaScript.

Add the following code examples one by one to your project and see if you get the same result in the simulator.

Add this code	Result
let answer = 4 + 5 basic.showNumber(answer)
let answer = 6 - 3 basic.showNumber(answer)
let answer = 2 * 7 basic.showNumber(answer)
let answer = 10 / 2 basic.showNumber(answer)
let answer = 5 basic.forever(function () { basic.showNumber(answer) }) input.onButtonPressed(Button.A, function () { answer++ })
let answer = 5 basic.forever(function () { basic.showNumber(answer) }) input.onButtonPressed(Button.A, function () { answer++ }) // add this code input.onButtonPressed(Button.B, function () { answer-- })

The + operator can also be used to join (concatenate) strings together.

let firstName = "Stefan"
let lastName = "Jones"
let fullName = firstName + " " + lastName

This will make fullName equal to Stefan Jones.

If you add strings and numbers together then JavaScript will treat the number as a string.

let fname = "Jane"
let age = 25
let x = fname + age

This will make x equal to Jane25.

Let's try using the string operators. Delete all the previous code that you added.

Add the following code examples one by one to your project and see if you get the same result in the simulator.

Add this code	Result
let firstName = "Stefan" // put in your own name let lastName = "Jones" // put in your own name let fullName = firstName + " " + lastName basic.showString(fullName)
let fname = "Jane" // put in your own name let age = 25 // put in your own age let x = fname + age basic.showString(x)