Pearapps

protocol Kennycol {
    func kennyThang() -> String;
}

class KennyClass: Kennycol {
    func kennyThang() -> String {
        return "example"
    }
}

Pearapps

protocol MyDelegate { }

final class MyObject {
    let delegate: MyDelegate
    
    init(delegate: MyDelegate) {
        self.delegate = delegate
    }
}

Pearapps

 protocol MyDelegate: class { }

  final class MyObject {
      weak var delegate: MyDelegate?
  }

Pearapps

extension CollectionType where Index: BidirectionalIndexType {
    func lastIndexOf(isElement: Generator.Element -> Bool) -> Index? {
        return indices.reverse().filter { return isElement(self[$0]) }.first
    }
}

Pearapps

extension String {
    func toUpperCase() -> String {
        return uppercaseString
    }
}

extension SequenceType {
    @warn_unused_result
    func mapByCalling<T>(@noescape transformer: (Self.Generator.Element) throws -> (() -> T)) rethrows -> [T] {
        return try self.map(transformer).map({ $0() })

Pearapps

//: Playground - noun: a place where people can play

import UIKit

func makeView<ViewType: UIView>(f: () -> ViewType, translatesAutoresizingMaskIntoConstraints: Bool) -> ViewType {
    let view = f()
    view.translatesAutoresizingMaskIntoConstraints = translatesAutoresizingMaskIntoConstraints
    return view
}

Pearapps

extension Double {
    func toFloat() -> CGFloat {
        return CGFloat(self)
    }
}