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We assume you have some programming knowledge and experience. If you don t have experience with F# already, you ll still be familiar with many of the ideas it uses. However, you may also encounter some new and challenging ideas. For example, if you ve been taught that object-oriented (OO) design and programming are the only ways to think about software, then programming in F# may be a reeducation. F# fully supports OO development, but F# programming combines elements of both functional and OO design. OO patterns such as implementation inheritance play a less prominent role than you may have previously experienced. 6 covers many of these topics in depth. The following notes will help you set a path through this book depending on your background: C++, C#, Java, and Visual Basic: If you ve programmed in a typed OO language, you may find functional programming, type inference, and F# type parameters take a while to get used to. However, you ll soon see how to use these to make you a more productive programmer. Be sure to read s 2, 3, 5, and 6 carefully. Python, Scheme, Ruby, and dynamically typed languages: F# is statically typed and type-safe. As a result, F# development environments can discover many errors while you program, and the F# compiler can more aggressively optimize your code. If you ve primarily programmed in an untyped language such as Python, Scheme, or Ruby, you may think that static types are inflexible and wordy. However, F# static types are relatively nonintrusive, and you ll find the language strikes a balance between expressivity and type safety. You ll also see how type inference lets you recover succinctness despite working in a statically typed language.

To add a data record using the data form, do the following: 1. Click the New button. 2. Type the data into the data field boxes. 3. Click the New button again. To delete a data record using the data form, do the following: 1. Use the Find Prev, Find Next, or Criteria buttons to locate the data record that you want to delete. 2. Click the Delete button, and click OK.

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Be sure to read s 2 to 6 carefully, paying particular attention to the ways in which types are used and defined. Typed functional languages: If you are familiar with Haskell, OCaml, or Standard ML, you will find the core of F# readily familiar, with some syntactic differences. However, F# embraces .NET, including the .NET object model, and it may take you a while to learn how to use objects effectively and how to use the .NET libraries themselves. This is best done by learning how F# approaches OO programming in s 6 to 8 and then exploring the applied .NET programming material in s 10 to 19, referring to earlier chapters where necessary. Haskell programmers will also need to learn the F# approach to imperative programming, described in 4, since many .NET libraries require a degree of imperative coding to create, configure, connect, and dispose of objects. We strongly encourage you to use this book in conjunction with a development environment that supports F# directly, such as Visual Studio 2005 or Visual Studio 2008. In particular, the interactive type inference in the F# Visual Studio environment is exceptionally helpful for understanding F# code: with a simple mouse movement you can examine the inferred types of the sample programs. These types play a key role in understanding the behavior of the code.

After selecting Other from the pop-up menu, a list of available directories will appear. Under Local, select the new MCX node, as shown in Figure 7-12.

source for information on the aspects of F# explored in this book is http://www.expert-fsharp.com, and you can download all the code samples used in this book from http://www.expert-fsharp.com/ CodeSamples. As with all books, it is inevitable that minor errors may have crept into the text. Adjustments may also be needed to make the best use of versions of F# beyond version 1.9.2, which was used for this book. An active errata and list of updates will be published at http://www.expert-fsharp.com/Updates.

To find specific data records using the data form, do the following: 1. Click the Criteria button. 2. Type text in any of the data field boxes for which you want to find matching data records. 3. Click the Find Next or Find Prev buttons to move back and forth through any matching data records. 4. To return to all of the data records, click the Criteria button, click the Clear button, and click the Form button.

n this chapter, we cover some simple interactive programming with F# and .NET. By now you should have downloaded and installed a version of the F# distribution as described in 1. In the sections that follow, we use F# Interactive, a tool you can use to execute fragments of F# code interactively and a convenient way to explore the language. Along the way, you ll see examples of the most important F# language constructs and many important libraries.

The .NET namespace System.IO contains the primary .NET types for reading/writing bytes and text to/from data sources. The primary output constructs in this namespace are as follows: System.IO.BinaryWriter: Writes primitive data types as binary values. Create using new BinaryWriter(stream). You can create output streams using File.Create(filename). System.IO.StreamWriter: Writes textual strings and characters to a stream. The text is encoded according to a particular Unicode encoding. Create by using new StreamWriter(stream) and its variants or by using File.CreateText(filename). System.IO.StringWriter: Writes textual strings to a StringBuilder, which eventually can be used to generate a string.

When you choose /Local/MCX, the text will change to Viewing local directory: /Local/MCX. Not authenticated, as in Figure 7-13.

s To restore a data record that is currently being changed back to its original data values using the data Tip

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