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    NSBlockOperation *operation = [NSBlockOperation blockOperationWithBlock:^{
        [[[RACSignal startEagerlyWithScheduler:[RACScheduler scheduler] block:^(id <RACSubscriber> subscriber) {
            NSManagedObjectContext *context = [NSManagedObjectContext contextWithMainContext:self.managedObjectContext];    // self is AppDelegate
            [context attachToCurrentScheduler];
            [subscriber sendNext:nil];
            [subscriber sendCompleted];
        }] saveContext] subscribeCompleted:^{
            NSLog(@"Completed");
        }];
    }];

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// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

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let first : Int? = "1".toInt()
let second : Int? = "2".toInt()

switch (first, second) {
case (.Some(let f), .Some(let s)):
    println(f + s)
default:
    println("error")
}

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UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0.0, 0.0, 50.0, 500.0)];
view.translatesAutoresizingMaskIntoConstraints = NO;
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0.0, 0.0, 50.0, 44.0)];
label.translatesAutoresizingMaskIntoConstraints = NO;
label.lineBreakMode = NSLineBreakByWordWrapping;
[label setContentHuggingPriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisVertical];
[label setContentCompressionResistancePriority:UILayoutPriorityRequired forAxis:UILayoutConstraintAxisVertical];
label.text = @"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
label.numberOfLines = 0;
NSLog(@"%@", NSStringFromCGRect(label.frame));

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let person = NSEntityDescription.insertNewObjectForEntityForName("Person", inManagedObjectContext: context) as Person

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class A {
    var firstName: String?
    var lastName: String?
}

class B: A {
    var middleName: String?
}

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let a: Int? = 10
let b: Int? = 20
let values = [a, b].flatMap { $0 }
let c: Int? = values.isEmpty ? nil : values.reduce(0, combine: +)

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func get<T>(sv: T, key: String) -> Any? {
    let mirror = Mirror(reflecting: sv)
    
    for (name, value) in mirror.children where name == key {
        return value
    }
    
    return nil
}

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UISearchBar *searchBar = [[[UISearchBar alloc] initWithFrame:CGRectZero] autorelease];
[searchBar sizeToFit];
self.tableView.tableHeaderView = searchBar;

[[[UISearchDisplayController alloc] initWithSearchBar:searchBar contentsController:self] autorelease];
self.searchDisplayController.delegate = self;
self.searchDisplayController.searchResultsDataSource = self;
self.searchDisplayController.searchResultsDelegate = self;

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#if NS_BLOCKS_AVAILABLE
- (void)showWhileExecutingBlock:(void (^)())block animated:(BOOL)animated {
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(void) {
        block();
        
        dispatch_async(dispatch_get_main_queue(), ^(void) {
            [self cleanUp];
        });
    });