In programming, textual content is represented by strings.
You have seen and used strings already.
"Hello, playground", for example, is a string that appears at the top of every newly created playground.
Like all strings, it can be thought of as an ordered collection of characters.
In reality, Swift strings are not themselves collections, but they do provide a variety of views into their underlying contents that are collections.
In this chapter, you will see more of what strings can do.
In Swift, you create strings with the String type. Create a new playground called Strings and add the following new instance of the String type.
Listing 7.1 Hello, playground
var str = "Hello, ...