jdewind

class Car
  include RequireOptions
  def go(opts)
    gear, speed = require_options(opts, :speed, :gear)
    # ...
  end
end

jdewind

@implementation ConfirmationAlert
+ (void)show:(NSString *)message delegate:(id<UIAlertViewDelegate>)theDelegate {
  UIAlertView *alertView = [[[UIAlertView alloc] initWithTitle:@"Confirm" message:message delegate:theDelegate cancelButtonTitle:@"Cancel" otherButtonTitles:@"Confirm", nil] autorelease];
  [alertView show];
}
@end

jdewind

@implementation MyObject
-(void)showOneConfirmationAlert:(NSMutableDictionary *)externalState {
  externalStateForOneConfirmationAlert = [externalState retain];
  oneConfirmationAlert = [[ConfirmationAlert show:@"Are you sure about this?" delegate:self] retain];
}

-(void)showAnotherConfirmationAlert:(NSMutableDictionary *)externalState {
  externalStateForAnotherConfirmationAlert = [externalState retain];
  oneConfirmationAlert = [[ConfirmationAlert show:@"Again, are you sure?" delegate:self] retain];
}

jdewind

typedef void (^ConfirmationBlock)(UIAlertView *);

jdewind

+ (void)show:(NSString *)message confirmed:(ConfirmationBlock)confirmBlock canceled:(ConfirmationBlock)canceledBlock {
  if(blocks == nil) {
    blocks = [[NSMutableDictionary dictionary] retain];
    delegate = [[BlockConfirmationAlert alloc] init];
  }  
  
  UIAlertView *alertView = [[[UIAlertView alloc] initWithTitle:@"Confirm" message:message delegate:delegate cancelButtonTitle:@"Cancel" otherButtonTitles:@"Confirm", nil] autorelease];
  NSDictionary *blockDict = [NSDictionary dictionaryWithObjectsAndKeys:[[confirmBlock copy] autorelease], @"confirm", [[canceledBlock copy] autorelease], @"cancel", nil];  
  [blocks setObject:blockDict forKey:[NSNumber numberWithUnsignedInt:[alertView hash]]];  
  [alertView show];

jdewind

+ (void)showOneConfirmationAlert:(NSMutableDictionary *)externalState {
  [BlockConfirmationAlert show:@"Are you sure about this?"   
   confirmed:^(UIAlertView *alertView) {
     //...
     NSLog([externalState objectForKey:@"Key"]);
   } 
   canceled:^(UIAlertView *alertView) {
    //...
    NSLog([externalState objectForKey:@"DifferentKey"]);                      
  }];  

jdewind

NSInvocation *invocation;
//set it up
@try {
  objc_msgSend(obj, [invocation selector]);
}
@catch (NSException * e) {
 NSLog(@"Caught exception: %@", e);
}

jdewind

NSInvocation *invocation;
// Create it
[invocation setTarget:obj];
[invocation setSelector:@selector(myMethod)];
  
@try {
  [invocation invoke];
}
@catch (NSException * e) {
  NSLog(@"This exception cannot be caught");

jdewind

  SHKItem *item = [[[SHKItem alloc] init] autorelease];
  item.shareType = SHKShareTypeText;
  item.contextBlock = ^(NSString *selectedSharer, id item) {
    if ([selectedSharer isEqualToString:@"SHKTwitter"]) {
      [item setShareType:SHKShareTypeURL];
      [item setURL:[NSURL URLWithString:@"http://www.google.com"]];
      [item setTitle:@"Tweeting this! #HashTagsAreCoolForKids"];
    } else {
      [item setMessage:@"This is for everything else http://www.google.com"];
    }

jdewind

          if (state == MotionState.DRAGGING) {
            bottomCaliperMatrix.set(bottomCaliperSavedMatrix);
            float yoffset = motionEvent.getY() - startPoint.y;
            
            bottomCaliperMatrix.postTranslate(0, yoffset);
            float[] bottomMatrix = new float[9];
            bottomCaliperMatrix.getValues(bottomMatrix);
            float delta = Math.abs(Math.min(bottomMatrix[5] - 79, 0));
            bottomCaliperMatrix.postTranslate(0, delta);
          }