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#light open System.IO let filename = "test.txt" let file = if File.Exists(filename) then Some(new FileInfo(filename, Attributes = FileAttributes.ReadOnly)) else None Note that you need to test for the file s existence to avoid a runtime exception when trying to set the Attributes property. F# allows you to set type parameters when calling a constructor, because it is not always possible to infer the type parameter of when making a constructor call. The type parameters are surrounded by angle brackets (<>) and separated by commas. The next example demonstrates how to set a type parameter when calling a constructor. You can create an instance of System.Collections.Generic.List, which can be used only with integers by setting its type parameter when it is created. In F# System.Collections.Generic.List is called ResizeArray to avoid confusion with F# lists. #light open System let intList = let temp = new ResizeArray<int>() in temp.AddRange([| 1 ; 2 ; 3 |]); temp intList.ForEach( fun i -> Console.WriteLine(i) ) The results are as follows: 1 2 3 The previous example also demonstrates another nice feature of F# when interoperating with non-F# libraries. .NET APIs often use a .NET construct called delegates, which are conceptually a kind of function value. F# functions will automatically be converted to .NET delegate objects if their signatures match. You can see this on the last line, where an F# function is passed directly to a method that takes a .NET delegate type. To keep methods as flexible as possible, you may prefer not to specify a type parameter when importing methods that take generic delegates or perhaps when you re creating a wrapper F# function around constructors for a non-F# library. You achieve this by using the underscore (_) in place of the type parameter, as in the first line of the next example. (The following example uses the forward operator, |>, which I explain in the The |> Operator section.) #light open System
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let findIndex f arr = Array.FindIndex(arr, new Predicate<_>(f)) let rhyme = [|"The"; "cat"; "sat"; "on"; "the"; "mat" |] printfn "First word ending in 'at' in the array: %i" (rhyme |> findIndex (fun w -> w.EndsWith("at"))) The results of this example, when compiled and executed, are as follows: First word ending in 'at' in the array: 1 Here you import the FindIndex method from the System.Array class, so you can use it in a curried style. If you had not explicitly created a delegate, the identifier f would have represented a predicate delegate rather than a function, meaning all calls to findIndex would need to explicitly create a delegate object, which is not ideal. However, if you had specified a type when creating the Predicate delegate in the definition of findIndex, then you would have limited the use of the findIndex function to arrays of a specific type. Occasionally, this may be what you want to do, but it is not usually the case. By using the underscore, you avoid having to specify a type for the findIndex function, keeping it nice and flexible.
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Indexers are a .NET concept that are designed to make a collection class look more like an array. Under the hood an indexer is a special property that is always called Item and has one or more parameters. It is important you have easy access to an indexer property, because many classes within the BCL have indexers. In respect to syntax, F# offers two ways of using an indexer. You can explicitly use the Item property, or you can use an array-like syntax, with brackets instead of parentheses around the index. open System.Collections.Generic let stringList = let temp = new ResizeArray<string>() in temp.AddRange([| "one" ; "two" ; "three" |]); temp let itemOne = stringList.Item(0) let itemTwo = stringList.[1] printfn "%s %s" itemOne itemTwo This example associates the strings "one" and "two" with the identifiers itemOne and itemTwo, respectively. The association of "one" with itemOne demonstrates explicitly using the Item property. The association of "two" with itemTwo uses the bracket syntax.
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