// "HTML" is at the start of a variable name,so we use lowercase "html"
let htmlBodyContent: String = "<p>Hello,World!</p>"
// Prefer using ID to Id
let profileID: Int = 1
// Prefer URLFinder to UrlFinder
class URLFinder {
    /* ... */
}

class MyClassName {
    // use `k` prefix for constant primitives
    static let kSomeConstantHeight: CGFloat = 80.0
    // use `k` prefix for non-primitives as well
    static let kDeleteButtonColor = UIColor.redColor()
    // don't use `k` prefix for singletons
    static let sharedInstance = MyClassName()
    /* ... */
}

class SomeClass<t> { /* ... */ }
class SomeClass<model> { /* ... */ }
protocol Modelable {
    associatedtype Model
}
protocol Sequence {
    associatedtype IteratorType: Iterator
}</model></t>

// PREFERRED
class RoundAnimatingButton: UIButton { /* ... */ }
// NOT PREFERRED
class CustomButton: UIButton { /* ... */ }

// PREFERRED
class RoundAnimatingButton: UIButton {
    let animationDuration: NSTimeInterval
    func startAnimating() {
        let firstSubview = subviews.first
    }
}
// NOT PREFERRED
class RoundAnimating: UIButton {
    let aniDur: NSTimeInterval
    func srtAnmating() {
        let v = subviews.first
    }
}

// PREFERRED
class ConnectionTableViewCell: UITableViewCell {
 let personImageView: UIImageView
 let animationDuration: NSTimeInterval
    // it is ok not to include string in the ivar name here because it's obvIoUs
    // that it's a string from the property name
 let firstName: String
    // though not preferred,it is OK to use `Controller` instead of `ViewController`  let popupController: UIViewController
 let popupViewController: UIViewController
    // when working with a subclass of `UIViewController` such as a table view
    // controller,collection view controller,split view controller,etc.,// fully indicate the type in the name.
 let popupTableViewController: UITableViewController
    // when working with outlets,make sure to specify the outlet type in the
    // variable name.
 @IBOutlet weak var submitButton: UIButton!
 @IBOutlet weak var emailTextField: UITextField!
 @IBOutlet weak var nameLabel: UILabel!
}
// NOT PREFERRED
class ConnectionTableViewCell: UITableViewCell {
    // this isn't a `UIImage`, so shouldn't be called image
    // use personImageView instead
 let personImage: UIImageView
    // this isn't a `String`, so it should be `textLabel`  let text: UILabel
    // `animation` is not clearly a time interval
    // use `animationDuration` or `animationTimeInterval` instead
 let animation: NSTimeInterval
    // this is not obvIoUsly a `String`     // use `transitionText` or `transitionString` instead
 let transition: String
    // this is a view controller - not a view
 let popupView: UIViewController
    // as mentioned prevIoUsly,we don't want to use abbreviations,so don't use
    // `VC` instead of `ViewController`  let popupVC: UIViewController
    // even though this is still technically a `UIViewController`, this variable
    // should indicate that we are working with a *Table* View Controller
 let popupViewController: UITableViewController
    // for the sake of consistency,we should put the type name at the end of the
    // variable name and not at the start
 @IBOutlet weak var btnSubmit: UIButton!
 @IBOutlet weak var buttonSubmit: UIButton!
    // we should always have a type in the variable name when dealing with outlets
    // for example,here,we should have `firstNameLabel` instead
 @IBOutlet weak var firstName: UILabel!
}

// here,the name is a noun that describes what the protocol does
protocol TableViewSectionProvider {
    func rowHeight(atRow row: Int) -> CGFloat
    var numberOfRows: Int { get }
    /* ... */
}
// here,the protocol is a capability,and we name it appropriately
protocol Loggable {
    func logCurrentState()
    /* ... */
}
// suppose we have an `InputTextView` class,but we also want a protocol
// to generalize some of the functionality - it might be appropriate to
// use the `Protocol` suffix here
protocol InputTextViewProtocol {
    func sendTrackingEvent()
    func inputText() -> String
    /* ... */
}