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Using the System Types
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Table 10-4 shows some of the most useful core types from the System namespace. These types are particularly useful because they take real care to define correctly. Table 10-4. Useful Core Types from the System Namespace
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Function
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System.DateTime System.DayOfWeek System.Decimal
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Description
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A type representing a date and time An enumeration type representing a day of the week A numeric type suitable for financial calculations requiring large numbers of significant integral and fractional digits and no round-off errors A type representing a 128-bit globally unique ID A type with an underlying value type 'T but that can be assigned null like a reference type A type representing a time interval A type representing a uniform resource identifier (URI), such as an Internet URL
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CHAPTER 10 USING THE F# AND .NET LIBRARIES
The following session shows some sample uses of the DateTime type: > open System;; > DateTime.Parse("13 July 1968");; val it : DateTime = 13/07/1968 00:00:00 {Day = 13; DayOfWeek = Saturday; DayOfYear = 195; Hour = 0; Millisecond = 0; Minute = 0; Month = 7; Second = 0; Ticks = 620892000000000000L; TimeOfDay = 00:00:00; Year = 1968;} > let date x = DateTime.Parse(x);; val date : string -> DateTime > printfn "date = %A" (date "13 July 1968");; date = 13/07/1968 00:00:00 val it : unit = () > printfn "birth = %A" (date "18 March 2003, 6:21:01pm");; birth = 18/03/2003 18:21:01 val it : unit = () Note that formatting dates depends on the user s localization settings; you can achieve more explicit formatting by using the System.DateTime.ToString overload that accepts explicit format information. Here you use the System.Uri type to parse a URL: > open System;; > System.Uri.TryCreate("http://www.thebritishmuseum.ac.uk/", UriKind.Absolute);; val it : bool * System.Uri = (true, http://www.thebritishmuseum.ac.uk/ { AbsolutePath = "/"; ... DnsSafeHost = "www.thebritishmuseum.ac.uk"; ... Port = 80; ... Scheme = "http"; }) > Uri.TryCreate("e3 %//ww.gibberish.com", UriKind.Absolute);; val it : bool * Uri = (false, null)
CHAPTER 10 USING THE F# AND .NET LIBRARIES
Many .NET types are used to hold static functions, such as those for converting data from one format to another. Types such as System.Random play a similar role via objects with a small amount of state. Table 10-5 shows some of the most useful of these types. Table 10-5. Useful Services from the System Namespace
Function
System.BitConverter
Description
Contains functions to convert numeric representations to and from bit representations Contains functions to convert between various numeric representations Contains constants and static methods for trigonometric, logarithmic, and other common mathematical functions Provides objects to act as random-number generators Provides objects implementing various types of comparisons on strings (case insensitive, and so on)
System.Convert System.Math
System.Random System.StringComparer
Using Regular Expressions and Formatting
In 3, you saw the different forms of string literals (strings with escape characters, verbatim strings, and byte arrays) and the most typical operations, such as concatenation using string builders. You may also remember that string values are immutable and that string operations that seem to change their input actually return a new string that represents the result. The following sections cover further ways to work with strings and text.
Matching with System.Text.RegularExpressions
One of the most popular ways of working with strings as data is through the use of regular expressions. You do this using the functionality from the .NET System.Text.RegularExpressions namespace. To get started, first note that the F# library includes the following definition: open System.Text.RegularExpressions let regex s = new Regex(s) To this, you can add the following Perl-like operators: let (=~) s (re:Regex) = re.IsMatch(s) let (<>~) s (re:Regex) = not (s =~ re)
CHAPTER 10 USING THE F# AND .NET LIBRARIES
Here, the inferred types are as follows: val regex : string -> Regex val ( =~ ) : string -> Regex -> bool val ( <>~ ) : string -> Regex -> bool The infix operators allow you to test for matches: > let samplestring = "This is a string";; val samplestring : string > if samplestring =~ regex "his" then printfn "A Match! ";; A Match! val it : unit = () Regular expressions can include *, +, and symbols for zero or more occurrences, one or more occurrences, and zero or one occurrences of the immediately preceding regular expression, respectively, and can include parentheses to group regular expressions. For example: > "This is a string" =~ regex "(is )+";; val it : bool = true Regular expressions can also be used to split strings: > (regex " ").Split("This is a string");; val it : string [] = [|"This"; "is"; "a"; "string"|] Here, you use the regular expression " " for whitespace. In reality, you probably want to use the regular expression " +" to match multiple spaces. Better still, you can match any Unicode whitespace character using \s, including end-of-line markers; however, when using escape characters, you should use verbatim strings to specify the regular expression, such as @"\s+". 3 discussed verbatim strings. Let s try this: > (regex @"\s+").Split("I'm a little teapot");; val it : string [] = [|"I'm"; "a"; "little"; "teapot"|] > (regex @"\s+").Split("I'm a little \t\t\n\t\n\t teapot");; val it : string [] = [|"I'm"; "a"; "little"; "teapot"|] Here s how to match by using the method Match instead of using =~ and IsMatch. This lets you examine the positions of a match:
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