Concatenation of Swift strings

There are two main ways to connect strings:

1. Add a string directly after the string; use + in Swift to stitch strings together directly. Such as:

Let str = "Hello"

Let str2 = "world!"

Let STR3 = str + str2

Print ("STR3 = \ (STR3)")

The output is: Hello world!

2. Concatenation of string arrays into a string, using the joined method to stitch together elements of a string array into a new string

Let array11: [String] = ["AAA", "BBB", "CCC"]

To stitch elements in an array into a string

Let arraystr:string! = array11.joined (separator: ",")

Print ("Arraystr = \ (arraystr!)")

Concatenation of Swift strings