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Where possible, avoid revealing concrete representations such as records, fields, and implementation inheritance hierarchies in framework APIs. The rationale is that one of the overriding aims of library design is to avoid revealing concrete representations of objects, for the obvious reason that you may want to change the implementation later. For example, the concrete representation of System.DateTime values isn t revealed by the external, public API of the .NET library design. At runtime, the Common Language Runtime knows the committed implementation that will be used throughout execution. However, compiled code doesn t pick up dependencies on the concrete representation.

We would not be able to view the contents directly of the root directory, but once we traversed into a subfolder, such as /Applications (possible because it is executable), we would be subject to the Application s folders permissions, and subsequently the permissions on any of the individual files in that subdirectory Now, because we don t have read access to list the contents of the root volume, we wouldn t be able to traverse into a subfolder unless we knew that it existed and what it was named But this type of security through obscurity can also be bypassed What we want to emphasize here is that denying users read privileges on a directory will not prevent them from traversing into its subdirectories, where they ll have any access granted at the applicable owner, group or everyone classes, a potentially less secure environment.

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Back in the days when a car phone meant your phone was built into a car, cell towers actually carried an analog signal, much like a radio signal but at a different frequency. This was the first generation, or 1G, system. The next wave of technology was 2G. Instead of using an analog signal, 2G networks are digital, and most (but not all) carriers started settling on the GSM standard. Verizon and Sprint opted for CDMA instead. Today most networks offer higher-speed 3G networks of various names, and some are even starting to roll out 4G networks. Once you ve selected a phone and a carrier, you don t really need to understand all the technical specs of the various wireless technologies and how they re marketed, but you do need to understand the basics. Other than voice, there are four basic ways your phone connects to signals. Those are Wi-Fi, Bluetooth, GPS, and data.

Where possible, avoid using large discriminated unions in framework APIs, especially if you expect there is a chance that the representation of information in the discriminated union will undergo revision and change. For frameworks, you should typically hide the type or use active patterns to reveal the ability to pattern-match over language constructs. 9 describes active patterns. This doesn t apply to the use of discriminated unions internal to an assembly or to an application. Likewise, it doesn t apply if the only likely future change is the addition of further cases, and you re willing to require that client code be revised for these cases. Finally, active patterns can incur a performance overhead, and this should be measured and tested, although their benefits frequently outweigh this cost.

Modes are established on a file through the use of a bit-flag system To truly understand this system, it is best to look at it from a command line system (we will cover GUI permissions a bit further on in this section) For example, consider the list of files and directories in the /Users folder that the command ls al /Users produces, shown in Figure 4 1..

Note Using large, volatile discriminated unions freely in APIs encourages people to use pattern-matching

against these discriminated union values. This is appropriate for unions that don t change. However, if you reveal discriminated unions indiscriminately, you may find it very hard to version your library without breaking user code.

Figure 4 1. Output of command `ls al /Users` with Permissions, owner, group, and folder name identified.

Wi-Fi signals are generally the fastest way to connect to the Internet. This is the same technology that connects laptops and other wireless devices to networks. It s fast but

In 5, you saw various ways to represent a dictionary of operations explicitly, such as using tuples of functions or records of functions. In general, we recommend that you use object interface types for this purpose, because the syntax associated with implementing them is generally more convenient.

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