# creating a struct
struct Person {
    String name,
    Number age,
    String sex
}

var a = Person("John Smith", 41, :man)

a.age += 1                  # increment age
a.name = "Dr. #{a.name}"    # update name

say a.name          #=> "Dr. John Smith"
say a.age           #=> 42
say a.sex           #=> "man"