gistfile1.matlab

# File: MainView.m

[Doorman requestUnlockDoor:^(BOOL successfulRequest) {
  if (successfulRequest) {
    // do stuff
  }
  else {
    // do other stuff
  }
}];


# File: Doorman.m

@implementation Doorman

+ (void)requestUnlockDoor:(void(^)(BOOL successfulRequest))completionHandler {
    completionHandler(FALSE);
}

@end

class Doorman
  def self.open_door(&block)
      block.call true #or false
end

Doorman.open_door do |success|
  if success
    puts "success"
  else
    puts "failure"
  end
end