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XP team: What does that mean other than transferring items from a shopping cart to an order Do you need to gather any additional information Customer: No, we already have their account information. We may allow them to ship the product to a different address in the future, but for now, they can only use their account s shipping address. XP team: Do they need an order confirmation Customer: That s a good idea. What do you recommend XP team: Let s create a new story and call it something like Display Order Confirmation. Customer: Okay, what kind of confirmation do you think we should use XP team: It s very common to provide an immediate order number in the response, and then also send an e-mail confirming the order. Customer: That s an excellent idea. How does this look

The problem with using this kind of function in F# is that typically it will rely on a side effect at some point It s easy to create functions with side effects in F#, but it can be undesirable when dealing with concurrency because it introduces problems Even in this simple example, you face a risk that the numbers won t print atomically, but instead become mixed up as they print out For example, you might see output like this: .. 6 174 10 .. Here two numbers form a three digit number that didn t exist in the collection Bearing that in mind, the SystemThreadingParallel class can still be useful on some occasions Imagine you need to send out a large number of emails, and you want to send these emails concurrently..

At the time of this writing version 1.7.1 is the most recent, but you may find that a later version is available when this book is released. The example code will still work, since newer versions of Pygame tend to be backward compatible.

7 introduced the Event module, which can be useful when working with events in WinForms When working with events in a WinForm, you often encounter cases where no event exactly fits what you want For example, the MouseButton event is raised when either the left or right mouse button is clicked, but you might want to respond only to the click of the left-mouse button In this case, you might find it useful to use the Eventfilter function to create a new event that responds only to a click of the leftmouse button The next example demonstrates how to do this: open SystemWindowsForms let form = // create a new form let temp = new Form() // subscribe the mouse click event filtering so it only // reacts to the left button tempMouseClick |> Eventfilter (fun e -> eButton = MouseButtonsLeft) |> Event.

XP team: Excellent. What s next Customer: I think the users should be able to look up an existing order s status. They should also be able to look at their order history. XP team: It sounds like you ve described two features order status and order history. Why don t we break these features into two different stories

The Pygame package contains a number of modules that can be used independently. There is a module for each of the devices that you might use in a game, and many others to make game creation a breeze. See Table 3-1 for all the Pygame modules. You access these modules through the pygame namespace; for instance, pygame.display refers to the display module.

add (fun _ -> MessageBoxShow("Left button") |> ignore) // return the form temp ApplicationRun(form) Here you use the filter function with a function that checks whether the left-mouse button is pressed; the resulting event is then piped forward to the listen function that adds an event handler to the event, exactly as if you had called the event s Add method You could have implemented this using an if expression within the event handler, but this technique has the advantage of separating the logic that controls the event firing from what happens during the event itself Several event handlers can reuse the new event, depending on your needs Listing 8-3 demonstrates how to use more of Event s functions to create a simple drawing application (see Figure 8-5).