Constants

In this Blogpost, you'll learn constants.

You will learn, how to declare, name and change them. 

You'll also learn about type inference (Swift's most important features).

Constants

let firstConstant: Int = 100 

This declares a constant called firstConstant which is of type Int. 

Then it sets the value of the firstConstant to the number 100.

let  piConstant: Double = 3.141

This is similar to the above constant, except the name and the type are different. 

This time the constant is a Double.

Once you've declared a constant, you can not change its data.