airspeedswift

postfix operator ..< { }
prefix operator ..< { }

struct RangeStart<I: ForwardIndexType> { let start: I }
struct RangeEnd<I: ForwardIndexType> { let end: I }

postfix func ..<<I: ForwardIndexType>(lhs: I) -> RangeStart<I>
{ return RangeStart(start: lhs) }

prefix func ..<<I: ForwardIndexType>(rhs: I) -> RangeEnd<I>

twostraws

//
// loveWins(): a simple function that accepts a UIImage and
// returns the same image blended with the rainbow flag
// of the LGBT pride movement.
// 
// This is released for pedagogical reasons (I've tried to make
// the code as easy to follow as possible!) but you're welcome
// to use it for any purpose – consider the code yours.
//
// If you're using Xcode 7 / Swift 2, you need to make a tiny

oisdk

private extension GeneratorType {
  mutating func any(@noescape pred: Element -> Bool) -> Bool {
    return next().map { el in pred(el) || any(pred) } ?? false
  }
  mutating func all(@noescape pred: Element -> Bool) -> Bool {
    return next().map { el in pred(el) && all(pred) } ?? true
  }
}

public extension SequenceType {

capttaco

import CoreData

protocol Fetchable
{
    typealias FetchableType: NSManagedObject
    
    static func entityName() -> String
    static func objectsInContext(context: NSManagedObjectContext, predicate: NSPredicate?, sortedBy: String?, ascending: Bool) throws -> [FetchableType]
    static func singleObjectInContext(context: NSManagedObjectContext, predicate: NSPredicate?, sortedBy: String?, ascending: Bool) throws -> FetchableType?
    static func objectCountInContext(context: NSManagedObjectContext, predicate: NSPredicate?) -> Int

emreberge

#define KeyPath(keyPath)\
^NSString *(void) {\
    __unused __typeof__(keyPath) x;\
    return [@#keyPath substringFromIndex:([@#keyPath rangeOfString:@"."].location + 1)];\
}()

zats

#!/usr/bin/env xcrun swift

// $ chmod +x script.swift
// $ ./script.swift
// or $ ./script.swift -xcode=/Applications/Xcode-beta.app

import Foundation

@noreturn private func failWithError(message: String) {
    print("🚫 \(message)")

krzyzanowskim

// http://blog.krzyzanowskim.com

import Cocoa

struct ChunkSequence<Element>: SequenceType {
    let chunkSize: Array<Element>.Index
    let collection: Array<Element>

    func generate() -> AnyGenerator<ArraySlice<Element>> {
        var offset:Array<Element>.Index = collection.startIndex

andymatuschak

A composable pattern for pure state machines with effects

State machines are everywhere in interactive systems, but they're rarely defined clearly and explicitly. Given some big blob of code including implicit state machines, which transitions are possible and under what conditions? What effects take place on what transitions?

There are existing design patterns for state machines, but all the patterns I've seen complect side effects with the structure of the state machine itself. Instances of these patterns are difficult to test without mocking, and they end up with more dependencies. Worse, the classic patterns compose poorly: hierarchical state machines are typically not straightforward extensions. The functional programming world has solutions, but they don't transpose neatly enough to be broadly usable in mainstream languages.

Here I present a composable pattern for pure state machiness with effects,

irace

/**
 *  A class that can be part of a tabbed navigational interface (expected to be a `UIViewController` but can also be a 
 *  coordinator that proxies through to an underlying controller).
 */
public protocol TabComponent {
    /// The tab metadata
    var tabItem: TabItem { get }

    var viewController: UIViewController { get }
}

alessaba

// Swift Playgrounds Beta 1.0
import AVFoundation
import AVKit
import Accelerate
import Accounts
import AudioToolbox
import AudioUnit
import CFNetwork
import CoreAudio
import CoreAudioKit