[RACAble(self.username) subscribeNext:^(NSString *newName) {
    NSLog(@"%@", newName);
}];

[[[[RACAble(self.username) 
    distinctUntilChanged] 
    take:3] 
    filter:^(NSString *newUsername) {
        return [newUsername isEqualToString:@"joshaber"];
    }] 
    subscribeNext:^(id _) {
        NSLog(@"Hi me!");
    }];

RAC(self.createEnabled) = [RACSignal 
    combineLatest:@[ RACAble(self.password), RACAble(self.passwordConfirmation) ] 
    reduce:^(NSString *password, NSString *passwordConfirm) {
        return @([passwordConfirm isEqualToString:password]);
    }];

[[RACSignal 
    flatten:@[ [client fetchUserRepos], [client fetchOrgRepos] ]] 
    subscribeCompleted:^{
        NSLog(@"They're both done!");
    }];

[[[[client 
    loginUser] 
    flattenMap:^(User *user) {
        return [client loadCachedMessagesForUser:user];
    }]
    flattenMap:^(NSArray *messages) {
        return [client fetchMessagesAfterMessage:messages.lastObject];
    }]
    subscribeCompleted:^{
        NSLog(@"Fetched all messages.");
    }];

RAC(self.imageView.image) = [[[[client 
    fetchUserWithUsername:@"joshaber"] 
    deliverOn:[RACScheduler scheduler]]
    map:^(User *user) {
        // This is on a background queue.
        return [[NSImage alloc] initWithContentsOfURL:user.avatarURL];
    }]
    // Now the assignment will be done on the main thread.
    deliverOn:RACScheduler.mainThreadScheduler]