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C:\Users\dsyme\Desktop> fsi.exe MSR F# Interactive, (c) Microsoft Corporation, All Rights Reserved NOTE: See 'fsi --help' for flags NOTE: NOTE: Commands: #r <string>;; reference (dynamically load) the given DLL. NOTE: #I <string>;; add the given search path for referenced DLLs. NOTE: #use <string>;; accept input from the given file. NOTE: #load <string> ...<string>;; NOTE: load the given file(s) as a single unit. NOTE: #quit;; exit. NOTE: NOTE: Visit the F# website at http://research.microsoft.com/fsharp. NOTE: Bug reports to fsbugs@microsoft.com. Enjoy! > <paste in the earlier program here> ;; val wordCount : string -> int * int val showWordCount : string -> unit Here F# Interactive has reported the type of the functions wordCount and showWordCount (you ll learn more about types in a moment). The keyword val stands for value; in F# programming, functions are just values, a topic we return to in 3. Also, sometimes F# Interactive will show a little more information than we show in this book (such as some internal details of the generated values); if you re trying out these code snippets, then you can just ignore that additional information. For now let s just use the wordCount function interactively: > let (nWords,nDups) = wordCount "All the king's horses and all the king's men";; val nWords : int val nDups : int > nWords;; val it : int = 9 > nDups;; val it : int = 2 > nWords - nDups;; val it : int = 7 This code shows the results of executing the function wordCount and binding its two results to the names nWords and nDups, respectively. You can examine the values by just entering each as a single expression, which assigns the result to a value called it and displays the value.

Summary

Object.ToString() is a somewhat undirected way of formatting data. Structural types such as tuples, lists, records, discriminated unions, collections, arrays, and matrices are often poorly formatted by this technique. The %A pattern uses .NET reflection to format any F# value as a string based on the structure of the value. For example: > printf "The result is %A\n" [1;2;3];; "The result is [1; 2; 3]" Generic structural formatting can be extended to work with any user-defined data types, a topic covered on the F# web site. This is covered in detail in the F# library documentation for the printf function.

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Examining the values shows that the given text contains nine words: two duplicates and seven words that occur only once. showWordCount prints the results instead of returning them as a value: > showWordCount "Couldn't put Humpty together again";; --> 5 words in the text --> 0 duplicate words From the output you can more or less see what the code does. Now that you ve done that, we ll go through the program in detail.

In this chapter, you have learned several methods to get the source code. Whether you choose to download a snapshot of the source tree, a copy of the GA release source code, or use the BitKeeper client software to gain access to the latest and greatest version, you can get and start using the source code. Now that is the beauty of open source!

Many constructs in the System.IO namespace need to be closed after use, partly because they hold on to operating system resources such as file handles. You can ignore this issue when prototyping code in F# Interactive. However, as we touched on earlier in this chapter, in more polished code, you should use language constructs such as use var = expr to ensure that the resource is closed at the end of the lexical scope where a stream object is active. For example: let myWriteStringToFile () = use outp = File.CreateText(@"playlist.txt") outp.WriteLine("Enchanted") outp.WriteLine("Put your records on")

Tip You can start F# Interactive in Visual Studio by selecting Tools Add-in Manager and then selecting

This is equivalent to the following: let myWriteStringToFile () = using (File.CreateText(@"playlist.txt")) (fun outp -> outp.WriteLine("Enchanted") outp.WriteLine("Put your records on")) where the function using has the following definition in the F# library: let using (ie : #System.IDisposable) f = try f(ie) finally ie.Dispose() use and using ensure that the underlying stream is closed deterministically and the operating system resources are reclaimed when the lexical scope is exited. This happens regardless of whether the scope is exited because of normal termination or because of an exception. 8 covers the language construct use, the operator using, and related issues in more detail.

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