Basics: Constants and Variables

Associate a name with a value of a particular type.

Additional information

• The value can’t be changed once it’s set.

Additional information

• Can be set to a different value in the future.

Let maximumNumberOfLoginAttempts = 10
var currentLoginAttempt = 0

Additional information

• Must be declared before they’re used.
• You can’t declare it again with the same name, or change it to store values of a different type.