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import Foundation

/// Call a throwing block synchronously.
func dispatch_sync(queue: dispatch_queue_t, block: () throws -> ()) throws {
    var error: ErrorType?
    dispatch_sync(queue) {
        do {
            try block()
        } catch let caughtError {
            error = caughtError

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#include <assert.h>
#include <string.h>
#include <stdio.h>
#include "wren.h"

void logFromWren(WrenVM *vm) {
    //double x = wrenGetArgumentDouble(vm, 0);  // returns 0 in this setting
    const char *message = wrenGetArgumentString(vm, 1);
    printf("logFromWren: %s\n", message);
}

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//
//  Created by Adam Preble on 2/19/15.
//

/// Weak, unordered collection of objects.
public struct WeakSet<T where T: AnyObject, T: Hashable> {
    typealias Element = T
    
    /// Maps Element hashValues to arrays of Entry objects.
    /// Invalid Entry instances are culled as a side effect of add() and remove()

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public class IdentifierGenerator {
    
    private let characters = Array("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
    private let separator = "-"
    
    public func generateIdentifier() -> String {
        let numCharacters = UInt32(characters.count)
        func randomCharacter() -> Character {
            let index = Int(arc4random_uniform(numCharacters))
            return characters[index]

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extension NSView {
    
    func insetSubview(subview: NSView, dx: CGFloat, dy: CGFloat) {
        addSubview(subview)
        subview.translatesAutoresizingMaskIntoConstraints = false
        let constrain = { (attribute: NSLayoutAttribute, constant: CGFloat) in
            subview.addConstraint(NSLayoutConstraint(
                item: subview,
                attribute: attribute,
                relatedBy: .Equal,

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import Foundation

func > (left: NSDate, right: NSDate) -> Bool {
    return left.compare(right) == .OrderedDescending
}

extension NSCalendar {
    func dateRange(startDate startDate: NSDate, endDate: NSDate, stepUnits: NSCalendarUnit, stepValue: Int) -> DateRange {
        let dateRange = DateRange(calendar: self, startDate: startDate, endDate: endDate, stepUnits: stepUnits, stepValue: stepValue, multiplier: 0)
        return dateRange

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import Cocoa

class AppDelegate: NSObject, NSApplicationDelegate {
                            
	@IBOutlet var window: NSWindow
	@IBOutlet var label: NSTextField

	func applicationDidFinishLaunching(aNotification: NSNotification?) {
		// Insert code here to initialize your application
	}

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Objective-C Bracing Style

I'm Adam Preble and this is the bracing style I like. Please don't use it unless you (a) like it, or (b) are contributing to a project of mine.

Rules

• Braces go on the next line for:
  • Method definitions.
  • if blocks:
  • After case statements, but only if required by local variables within the case.

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NSArray *things = ^{
    NSMutableArray *tmpArray = [NSMutableArray arrayWithCapacity:numThings];
    for (int i = 0; i < numThings; i++)
    {
        [tmpArray addObject: ... ];
    }
    return [tmpArray copy];
}();

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iOS & Cocoa Resources

• Big Nerd Ranch Blog (feat. Mark Dalrymple)
• iOS Dev Weekly (mailing list)
• NSHipster
• WWDC Videos
  • WWDC 2013
  • WWDC 2012
• iOS Programming Guide
• objc.io