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Adobe Flash is available for Android 2.2 and above as a download from the Android Market. You can use Bsquare s Flash Lite on Android 1.5 to play most videos, or you can use Skyfire s alternative web browser in Android 2.1. For the most part, the absence of Flash doesn t feel like a huge loss. Other than digital video, Flash is mainly used for serving advertising. You can t play Flash-based web games on Android 2.1 and below, but most phones are not fast enough to really do it justice if you could.

These hexadecimal sequences in the logs can help decipher why a crash occurred if foul play is suspected. Nine times out of ten, rather than confirm irregular activity, you will instead find that there is actually a technical problem that caused the crash.

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Whether a particular side effect is stronger or weaker depends very much on your application and whether the consequences of the side effect are sufficiently isolated and separated from other entities. Strong side effects can and should be used freely in the outer shell of an application or when you re scripting with F# Interactive; otherwise, not much can be achieved. When you re writing larger pieces of code, you should write your application and libraries in such a way that most of your code either doesn t use strong side effects or at least makes it obvious when these side effects are being used. Threads and concurrency are commonly used to mediate problems associated with strong side effects; 14 covers these issues in more depth.

It s generally thought to be bad style to combine delayed computations (that is, laziness) and side effects. This isn t entirely true; for example, it s reasonable to set up a read from a file system as a lazy computation using sequences. However, it s relatively easy to make mistakes in this sort of programming. For example, consider the following code: open System.IO let reader1, reader2 = let reader = new StreamReader(File.OpenRead("test.txt")) let firstReader() = reader.ReadLine() let secondReader() = reader.ReadLine() // Note: we close the stream reader here! // But we are returning function values which use the reader // This is very bad! reader.Close() firstReader, secondReader // Note: stream reader is now closed! The next line will fail! let firstLine = reader1() let secondLine = reader2() firstLine, secondLine This code is wrong because the StreamReader object reader is used after the point indicated by the comment. The returned function values are then called, and they try to read from the captured variable reader. Function values are just one example of delayed computations: other examples are lazy values, sequences, and any objects that perform computations on demand. Be careful not to build delayed

Chances are you see your doctor at regular intervals. The dentist you ll see every six months, and the family physician you ll see every year. Just as your body needs to be maintained in regular intervals, so must your computer. Maintenance scripts run at scheduled times, and if one is missed, much like a doctor s appointment, it is usually scheduled for the next available time. Maintenance scripts need to be run because they log what devices were plugged into a system, they back up the user database, and they do much more. Machines can be left off at night, laptops can get closed, and power outages can disable a system, helping to explain the disparity in time stamps you may

objects such as reader that represent handles to transient, disposable resources, unless those objects are used in a way that respects the lifetime of that resource. The previous code can be corrected to avoid using laziness in combination with a transient resource: open System.IO let line1, line2 = let reader = new StreamReader(File.OpenRead("test.txt")) let firstLine = reader.ReadLine() let secondLine = reader.ReadLine() reader.Close() firstLine, secondLine Another technique uses language and/or library constructs that tie the lifetime of an object to some larger object. For example, you can use a use binding within a sequence expression, which augments the sequence object with the code needed to clean up the resource when iteration is finished or terminates. This technique is discussed further in 8 and shown by example here: let reader = seq { use reader = new StreamReader(File.OpenRead("test.txt")) while not reader.EndOfStream do yield reader.ReadLine() } The general lesson is to try to keep your core application pure. Use both delayed computations (laziness) and imperative programming (side effects) where appropriate, but be careful about using them together.

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