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The second top-level item displayed in the Local Variables window is the this item. The this item refers to whichever object the keyword this refers. If the breakpoint occurs within a function that is part of an object, then this refers to the current object instance. The normal reference for this is the browser s window object. Note that any variables defined within the global scope will appear under the this item. The Local Variables window uses small icons next to a variable s name to indicate the variable s data type. The data types available are boolean, double, integer, null, object, string, and void. Figure 7-23 shows the Local Variables window with each data type. Note the icon that is used for each data type.

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This book is aimed primarily at IT professionals who want to get up to speed quickly on F#. A working knowledge of the .NET Framework and some knowledge of either C# or Visual Basic would be nice, but it s not necessary. All you really need is some experience programming in any language to be comfortable learning F#. Even complete beginners, who ve never programmed before and are learning F# as their first computer language, should find this book very readable. Though it doesn t attempt to teach introductory programming per se, it does carefully present all the important details of F#.

Other than the variable named objVar in Figure 7-23, all the data types are simple, nonobject data types, and their values are easily discernable in the Value column of the Local Variables window. Note how the objVar variable has a plus sign next to it, indicating that it can be opened to inspect the object s properties. Figure 7-24 shows the Local Variables window using an object variable type. Note that in this instance the breakpoint is set within an object s member function, meaning that within the Local Variables window the this item refers to the object instance itself while the scope item has no child items.

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This book teaches F#, by example, as a compiled language rather than a scripting language. By this I mean most examples are designed to be compiled with the fsc.exe compiler, either in Visual Studio or on a command line, rather than executed interactively with fsi.exe, the F# interactive environment. In reality, most examples will run fine either way. 2 gives you just enough knowledge about setting up an F# development environment to get you going. s 3, 4, 5, and 6 cover the core F# syntax. I deliberately keep the code simple, because this will give you a better introduction to how the syntax works. 7 looks at the core libraries distributed with F# to introduce you to their flavor and power, rather than to describe each function in detail. The F# online documentation (http:// research.microsoft.com/fsharp/manual/namespaces.html) is the place to get the details. Then you ll dive into how to use F# for the bread-and-butter problems of the working programmer. 8 covers user interface programming, 9 covers data access, and 10 covers how applications can take advantage of a network. The final chapters take you through the topics you really need to know to master F#. 11 looks at support for creating little languages or domain-specific languages (DSLs), a powerful and very common programming pattern in F#. 12 covers the tools you can use to debug and optimize F# programs. Finally, 13 explores advanced interoperation issues.

How to Obtain, Install, and Use F#

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Figure 7-24. Suspended within an object s member function, the Local Variable window shows the object s properties.

his chapter is designed to get you up and running with F# as quickly as possible. You ll look at how to obtain F#, how to install it on both Windows and Linux, and how to use the compiler in various ways. I ll also discuss what version of software the examples in this book were tested with and what extra software you might need to install.

The circuit was built on a solderless breadboard first and then transferred to a printed circuit, as shown in Figure 13-40.