Gi-lo

        // Just a string
        NSString *string = @"Trololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololololol";
       
        // Not so clever implicit BOOL cast
        BOOL hasText = [string length]; // Just add "> 0" to fix it btw.
        
        // Sure it has some text! ... eh wait what
        NSLog(@"String has some text: %@", hasText ? @"YES" : @"NO");

        // And to have some reference to the blog post ... (http://blog.bignerdranch.com/564-bools-sharp-corners/)

Gi-lo

- (NSURL *)URLWithString:(NSString *)string andQueryValuesForKeys:(NSString *)value, ... {
    if (!value) {
        return [NSURL URLWithString:string];
    }
    
    NSMutableString *queryString = [NSMutableString string];
    NSString *argument = nil;
    NSUInteger argumentCount = 0;

    va_list argumentList;

Gi-lo

On_iPhone(^{
     // Some iPhone only code
});

On_iPad(^{
     // Some iPad only code
});

or: