Swift coding style guide

Found two coding styles for Swift:

• github style guide for Swift: https://github.com/github/swift-style-guide
• raywenderlich style guide for Swift: https://github.com/raywenderlich/swift-style-guide

Interesting notes:

1. In github style, it suggests that let should be used over var binding whenever possible. This is to explicitly show the intent that a value is supposed to or not supposed to change.

2. In raywenderlich style, when declaring protocol conformance, use separate extension instead of declaring all together. Also, do not forget to add // MARK comments.

Preferred:

class MyViewcontroller: UIViewController {
  // class stuff here
}

// MARK: - UITableViewDataSource
extension MyViewcontroller: UITableViewDataSource {
  // table view data source methods
}

// MARK: - UIScrollViewDelegate
extension MyViewcontroller: UIScrollViewDelegate {
  // scroll view delegate methods
}

Not Preferred:

class MyViewcontroller: UIViewController, UITableViewDataSource, UIScrollViewDelegate {
  // all methods
}

3. In raywenderlich style, when unwrapping the optional, shadow the original name instead of using a new name.

Preferred:

var subview: UIView?

// later on...
if let subview = subview {
  // do something with unwrapped subview
}

Not Preferred:

var optionalSubview: UIView?

if let unwrappedSubview = optionalSubview {
  // do something with unwrappedSubview
}

4. In github style, prefer implicit getters on read-only properties.

Preferred:

var myGreatProperty: Int {
    return 4
}

subscript(index: Int) -> T {
    return objects[index]
}

Not Preferred:

var myGreatProperty: Int {
    get {
        return 4
    }
}

subscript(index: Int) -> T {
    get {
        return objects[index]
    }
}

5. In github style guide, it is mentioned to prefer structs over classes. Since I am still quite new to Swift, I will need to learn a bit more to really understand it.