Nate Armstrong armstrongnate

The introduction to Reactive Programming you've been missing

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.

	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.
	*/

	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
	}
	}

	// 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
	}