ericdke

// http://stackoverflow.com/a/35959239/2227743

enum MassUnit: Double {
    case Microgram = 1e-6
    case Milligram = 1e-3
    case Gram = 1
    case Kilogram = 1e3
    
    static let allUnits: [MassUnit] = [.Microgram, .Milligram, .Gram, .Kilogram]
    

ericdke

import XCPlayground
XCPlaygroundPage.currentPage.needsIndefiniteExecution = true

protocol CanBuildHouses {
    
    func startWorking()
    
}

protocol CanManageTeams {

ericdke

protocol ListensToEvents {
    func anEventHappened(code: Int)
}

class ClassicPrinter: ListensToEvents {
    func anEventHappened(code: Int) {
        print("CODE: \(code)")
    }
}

ericdke

infix operator ||= {}
func ||=<T>(inout left: Optional<T>, right: T) { left = left ?? right }

var foo:String? = nil // foo -> nil
foo ||= "Hello"       // foo -> "Hello"
foo ||= "Hi"          // foo -> "Hello"

ericdke

import UIKit
import XCPlayground
import Accelerate

extension UIImage {
    public func blur(size: Float) -> UIImage! {
        
        let boxSize = size - (size % 2) + 1
        let image = self.CGImage
        let inProvider = CGImageGetDataProvider(image)

ericdke

 public extension CollectionType {
    var permutations: [[Generator.Element]] {
        func permute<C: CollectionType>(items: C) -> [[C.Generator.Element]] {
            var scratch = Array(items) // This is a scratch space for Heap's algorithm
            var result: [[C.Generator.Element]] = [] // This will accumulate our result
            // Heap's algorithm
            func heap(n: Int) {
                if n == 1 {
                    result.append(scratch)
                    return

ericdke

let url = NSURL(fileURLWithPath: imagePath)

let cgiSrc = CGImageSourceCreateWithURL(url,nil)

let cfD:CFDictionaryRef = CGImageSourceCopyPropertiesAtIndex(cgiSrc!, 0, nil)!

let nsDic = NSDictionary(dictionary: cfD)

print(nsDic.description)

ericdke

extension String {
    func extractURLs() -> [NSURL] {
        var urls : [NSURL] = []
        do {
            let detector = try NSDataDetector(types: NSTextCheckingType.Link.rawValue)
            detector.enumerateMatchesInString(self,
                options: [],
                range: NSMakeRange(0, text.characters.count),
                usingBlock: { (result, _, _) in
                    if let match = result, url = match.URL {

ericdke

import AVFoundation

func getImageFromVideo(videoURL: String) -> UIImage? {
    do {
        let asset = AVURLAsset(URL: NSURL(fileURLWithPath: videoURL), options: nil)
        let imgGenerator = AVAssetImageGenerator(asset: asset)
        imgGenerator.appliesPreferredTrackTransform = true
        let cgImage = try imgGenerator.copyCGImageAtTime(CMTimeMake(0, 1), actualTime: nil)
        let image = UIImage(CGImage: cgImage)
        return image

ericdke

let binNum = 42
let binStr = String(binNum, radix: 2)
print(binStr)

let octNum = 42
let octStr = String(octNum, radix: 8)
print(octStr)

let hexNum = 42
let hexStr = String(hexNum, radix: 16)