Properties clarification

struct PropertiesOverview {

    // This is a *stored property*, in this case it is *mutable*
    // which means it can be changed later. Also, it's initial
    // value is 1. Type declaration Int is not mandatory, as
    // Swift can infer the *type* (note that Int is a type).
    // var anInteger = 1 would work as well
    var anInteger: Int = 1

    // This stored property is a constant, it's value cannot be
    // changed at a later point. As pointed out before, Swift
    // can infer the *type* String, so we do not explicitly need
    // it here
    let aString = "Hello"

    // This is a *computed* property, that is no value is actually
    // stored, but "calculated" or constructed. In this special case,
    // it only has a *getter*. The *type* is String.
    var anotherString: String {
         return "Hello" 
    }

    // This is also a *computed* property, this time it has a getter
    // and a setter. It also does not store values directly, but rather
    // gets and sets the value of the above declared **anInteger**.
    // Note that "newValue" is, as the name suggests, the variable
    // name of the new value that Swift provides by default within
    // the setter.
    var anotherInteger: Int {
       get { return anInteger }
       set { anInteger = newValue }
    }

    // This is a *type property*, that is you can access this **without**
    // having an instance of `PropertiesOverview`. You can access it via
    // dot notation: `PropertiesOverview.pi`
    static let pi: Double = 3.14159265359

   // ...
}