natecook1000

extension NSTimer {
    /**
    Creates and schedules a one-time `NSTimer` instance.
    
    - Parameters:
        - delay: The delay before execution.
        - handler: A closure to execute after `delay`.
    
    - Returns: The newly-created `NSTimer` instance.
    */

tjw

public protocol MeasurementUnit {
    // If we have one of this unit, how many millimeters is it?
    class var asMillimeters: Double { get }
}
public class Inch : MeasurementUnit {
    public class var asMillimeters: Double {
	get {
            return 25.4
	}
    }

prrane

// based on : http://stackoverflow.com/questions/24752627/accessing-ios-address-book-with-swift-array-count-of-zero

    // http://stackoverflow.com/questions/24752627/accessing-ios-address-book-with-swift-array-count-of-zero
    
    class func extractABAddressBookRef(abRef: Unmanaged<ABAddressBookRef>!) -> ABAddressBookRef? {
        if let ab = abRef {
            return Unmanaged<NSObject>.fromOpaque(ab.toOpaque()).takeUnretainedValue()
        }
        return nil
    }

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

calebd

extension Array {
    
    func first() -> Element? {
        if isEmpty {
            return nil
        }
        return self[0]
    }
    
    func last() -> Element? {