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The first tool to become familiar with is the solderless breadboard. The term breadboard dates back to when electronic hobbyists literally built projects on a plank of wood intended for cutting bread. Many styles of breadboards are available, but they all consist of columns of interconnected holes used for connecting components and a few long rows of holes at the top and bottom used for connecting power. Radio Shack sells a small breadboard (Catalog Number: 276-175) that is big enough to build all the projects in this book (see Figure A-1). A nice feature of this particular breadboard is that it has row- and column-identification marks that make construction easier. Throughout this book, we indicate the exact row and column where you should insert the lead of a device. By following these instructions precisely, your chance of making a mistake will be greatly reduced.

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and top. Note how the x parameter, given before the function name swap, is used within the function definition to get access to the record s other members, its fields: #light type Point = { mutable top : int ; mutable left : int } with member x.Swap() = let temp = x.top x.top <- x.left x.left <- temp end let printAnyNewline x = print_any x print_newline() let main() = printAnyNewline myPoint myPoint.Swap() printAnyNewline myPoint main() The results of this example, when compiled and executed, are as follows: {top = 3; left = 7;} {top = 7; left = 3;} You may have noticed the x parameter in the definition of the function Swap: member x.Swap() = let temp = x.top x.top <- x.left x.left <- temp This is the parameter that represents the object on which the function is being called. When a function is called on a value, as follows: myPoint.Swap() the value it is being called on is passed to the function as an argument. This is logical, when you think about it, because the function needs to be able to access the fields and methods of the value on which it is being called. Some OO languages use a specific keyword for this, such as this or Me, but F# lets you choose the name of this parameter by specifying a name for it after the keyword member, in this case x.

Rather than run off to your favorite weather site, you can simply access the Dashboard and glance at your local weather forecast! Dashboard widgets are nothing more than bits of HTML and JavaScript, with a little bit of CSS mixed in for good measure A good Dashboard widget has a single purpose and is small, doing one thing and doing it well Mac OS X Tiger shipped with a handful of widgets (a calendar, a flight tracker, a stock tracker, a weather widget, and so on), but now more than a thousand are available Dashboard widgets connect to the Internet to deliver real-time information; this means a single click keeps you up-to-date The real beauty of Dashboard is that pretty much anyone can create their own widget in fact, most of the widgets available for download were not written by Apple.

We demonstrate the construction process through a simple example. Figure A-2 shows a minimal 9V powered sensor design. The design just takes care of separating the power and sensor read parts of the 9V powered interface described in 9. Nevertheless, the circuit is useful for voltage input where measured voltage is something that can t be loaded by the NXT internal 10k resistor. It has only four parts, listed in the bill of materials in Table A-1.