Variable: information you can store for use later. This can be changed and redefined as needed.

Mathematical operators: symbols that perform pre-defined operations.

Type: classification of information.

Number: any number. Can only include digits and the decimal point.

String: any mix of letters, numbers, or symbols. To set a String value, use quotes around your value (for example: “Hello world!”)

Boolean: True or False. We’ll discuss this data type more later!

Function: a procedure or routine. These can be defined by the programming language or even by you! We will discuss creating your own functions in the Functions lesson.

A couple examples we cover here are Text() and type()

What is a variable?

Save information to use it later!

Set the value of a variable using the equal sign

For example: var = 2 sets a variable named var to the value 2

Mathematical operators are allowed when using variables of the same type

Mathematical operators

Use + to add

Use - to subtract

Use / to divide

Use * to multiply

Types of variables

Numbers

1.02

58

-30902838.7892223

Strings

“Code Shrew”

“Hello!$#mcknxknck”

“123”

Booleans

True

False

Check the type of any variable using the type() function

Variables can change if needed!

As you code longer scripts, you will find it useful to change the variables you have stored rather than creating another variable.

You can increase a variable’s value or even redefine it completely.