## Introduction

To work with the contents of variables, you use operators.

There are a wide variety of operators built into Swift.

The most common of which are the arithmetic operators, such as addition or division:

1 + 7 // 8
6 - 4 // 2
8 / 2 // 4
3 * 5 // 15

You can use equality operators. These check to see if two values are the same:

2 == 2 // true
2 != 2 // false
"yes" == "no" // false
"yes" != "no" // true

The comparison operators. These compare how similar two variables are to one another:

5 < 7 // true
1 > 4 // false
2 <= 1 // false
3 >= 3 // true

The . operator lets you access properties and methods of your variables:

true.description // "true"
4.advanced(by: 3) // 7