Use optionals when a value cannot be set. Think of optionals as containers that can take either a value or nil. Optionals gives us the ability to check whether the value is nil or not. To create an optional value, you will have to provide it with a data type followed by a question mark (?). Before we do that, let's create a string that is not an optional. Add the following to Playgrounds:
Now, let's add an optional to Playgrounds:
In this example, we created a string optional, and, if you notice in the Results Panel, it is nil. But for our notAnOptional, we see "This is not an optional". Now, on the next line, let's set optional equal to "This is an optional":
In our Results Panel, we see "This is an optional". Now let's print both notAnOptional and optional, as you will see a difference between...
