1 What is an Operator?
2 Arithmetic Operators
3 Try it out
4 String Operators
5 Try it out
6 Assignment Operators
7 Try it out
8 Comparison Operators
9 Try it out
10 Logical Operators
11 Try it out

1 - What is an Operator?

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.

Type	Description
Arithmetic Operators	For adding, subtracting, multiplication and division.
String Operators	For joining strings together.
Assignment Operators	For assigning values to variables.
Comparison Operators	For comparing two different values (equal to, greater than, less than etc.)
Logical Operators	For determining the logic between variables or values (and, or, not).

Mark your steps as done as you complete them.

done 30 points + GIF - Halloween Series

2 - Arithmetic Operators

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

Operator	Description	Example
+	For adding two numbers together.	`let answer = 4 + 5`
-	For subtracting one number from another.	`let answer = 6 - 3`
*	For multiplying two numbers together.	`let answer = 2 * 7`
/	For dividing one number by another.	`let answer = 10 / 2`

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

Operator	Description	Example
++	For incrementing a number (increasing it by 1).	`answer++`
--	For decrementing a number (decreasing it by 1).	`answer--`
%	Modulus operator (%) returns the division remainder.	`let answer = 8 % 3`

done 30 points + GIF - Sports Series

3 - Try it out

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-- })`

done 60 points + GIF - Animals Series

4 - String Operators

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.

done 20 points + GIF - Reactions Series

5 - Try it out

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

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)`

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)

done 30 points + GIF - Sports Series

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