Enumeration type is a common type in many programming languages, which normally presents a set of limited status for a program, such as list all the directions for a compass: enum CompassPoint { case north case south case east case west } However, enum provides more features than that: 1. Static values

Extension is a great feature in Swift, which can help us to create helper/utility variables and method, and etc. Use extension to conform protocols It is quite common to use protocols in any project, with extension, we can make the code more organized. extension CollectionViewController: UITableViewDelegate, UITableViewDataSource { // necessary methods

Unlike other programming languages, there are three types properties in Swift. Stored Properties They are constants or variables of a class, and part of the class instances that used to store values. One of the examples is the model class. class Car { var name: String var price: Float = 0.0

lazy variables are variables will be computed until accessing. In other words, lazy variables won't have the real value until get called/used. As lazy variables can be re-assigned, so it can't be used on constants which normally defined by let. One example of using lazy

swift compare custom class or custom struct