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Here 'a is a type variable that stands for any type, and thus the function can be used to time functions that return any kind of result. Note that F# has automatically inferred a generic type for the function, a technique called automatic generalization that lies at the heart of F# programming. We discuss automatic generalization in detail in 5. Here is an example of using the time function, which again reuses the http function defined in 2: > time (fun () -> http "http://www.newscientist.com");; val it : string * TimeSpan = ... (The HTML text and time will be shown here)

fsi.FloatingPointFormat fsi.FormatProvider fsi.PrintWidth fsi.PrintDepth fsi.PrintLength fsi.ShowProperties fsi.ShowDeclarationValues fsi.ShowIEnumerable

In a similar way, the key cache keeps track of the index blocks that have changed (called getting dirty ) When a dirty block is purged, its data is written back to the index file on disk before being replaced Conversely, when a clean block is purged it is simply removed from memory..

You can use existing .NET methods as first-class functions. For example:

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Gets or sets the format used for floating-point numbers, based on .NET Formatting specifications Gets or sets the cultural format used for numbers, based on .NET Formatting specifications Gets or sets the print width used for formatted text output Gets or sets the depth of output for tree-structured data Gets or sets the length of output for lists and other linear data structures Gets or sets a flag indicating whether properties should be printed for displayed values Gets or sets a flag indicating whether declaration values should be printed Gets or sets a flag indicating whether sequences should be printed in the output of the interactive session

Managed code are .NET applications that run under the control of the common language runtime (CLR). These applications can take advantage of all of the features of the CLR, specifically garbage collection and better program execution control. Unmanaged code are Windows applications that do not run under the CLR and therefore do not benefit from the .NET enhancements.

> open System.IO;; > [@"C:\Program Files"; @"C:\Windows"] |> List.map Directory.GetDirectories;; val it : string [] list = [ [|"C:\\Program Files\\Adobe"; "C:\\Program Files\\Apoint"; "C:\\Program Files\\CA"; "C:\\Program Files\\CE Remote Tools"; ...]; ... ] Sometimes you will need to add extra type information to indicate which overload of the method is required. We discuss method overloading in more detail in 6. For example, the following causes an error: > open System;; > let f = Console.WriteLine;; C:\misc\test.ml(11,8): error: FS0041: The method WriteLine is overloaded. Possible matches are shown below. Resolve the overloading by adding further type annotations to the arguments. Possible overload: 'Console.WriteLine(bool value) : unit'. Possible overload: 'Console.WriteLine(char value) : unit'. ... However, the following succeeds: > let f = (Console.WriteLine : string -> unit);; val f : string -> unit

Adds a printer for values compatible with the specific type 'a Adds a printer that shows any values compatible with the specific type 'a as if they were values returned by the given function Gets the command-line arguments after ignoring the arguments relevant to the interactive environment and replacing the first argument with the name of the last script file

I began by designing the database engine class using just pen and paper I could have used a UML drawing application, but since the class is small I just listed the methods that I needed For example, I needed methods to initialize, connect to, and shut down the embedded MySQL server These methods are easy to encapsulate as they don t need any parameters from the form One of the first challenges I encountered was error handling How can I communicate the errors to the client form without requiring the client to know anything about the embedded library There are probably dozens of ways to do this, but I chose to implement an error check method that allows the client to check for the presence of errors after an operation and then another method to retrieve the error message.

One important tool in F# programming is pattern matching, a general construct that combines decomposition and control. In the previous sections, you got a taste of how you can use pattern matching with tuple, list, and option values. However, you can also use pattern matching in many other situations. You ll see many other examples of pattern matching in this book, but let s start with some simple pattern matching over strings and integers. As you ve already seen, pattern matches on explicit values are introduced using the match ... with ... construct: let urlFilter url agent = match (url,agent) with | "http://www.control.org", 99 -> true | "http://www.kaos.org" , _ -> false | _, 86 -> true | _ -> false

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