swift string concatenation

let age = 28
let name = "John"
let isAlcoholic = true

var description = "\(name) is \(age) years old and \(isAlcoholic ? "is" : "isn't") alcoholic"let string1 = "hello"
let string2 = " there"
var welcome = string1 + string2 // hello therevar str1 = "Hello, world"
print(str1)// Create a literal empty string
var emptyString = ""

// Create an optional string
var emptyVariable: String?  // This allows this variable to have a null value, or nil in swift