Two-Dimensional Arrays in VB.NET

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Two-Dimensional Arrays
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Like other .NET languages, F# directly supports two-dimensional array values that are stored flat: that is, where an array of dimensions (N, M) is stored using a contiguous array of N * M elements. The types for these values are written using [,], such as in int[,] and double[,], and these types also support slicing syntax. Values of these types are created and manipulated using the values in the Array2D module. Likewise, there is a module for manipulating three-dimensional array values whose types are written int[,,]. You can also use the code in those modules as a template for defining code to manipulate arrays of higher dimension.
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Introducing the Imperative .NET Collections
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The .NET Framework comes equipped with an excellent set of imperative collections under the namespace System.Collections.Generic. You ve seen some of these already. The following sections look at some simple uses of these collections.
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CHAPTER 4 INTRODUCING IMPERATIVE PROGRAMMING
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Using Resizeable Arrays
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As mentioned in 3, the .NET Framework comes with a type System.Collections.Generic.List<'T>, which, although named List, is better described as a resizeable array. The F# library includes the following type abbreviation for this purpose: type ResizeArray<'T> = System.Collections.Generic.List<'T> Here is a simple example of using this data structure: > let names = new ResizeArray<string>();; val names : ResizeArray<string> > for name in ["Claire"; "Sophie"; "Jane"] do names.Add(name);; val it : unit = () > names.Count;; val it : int = 3 > names.[0];; val it : string = "Claire" > names.[1];; val it : string = "Sophie" > names.[2];; val it : string = "Jane" Resizable arrays use an underlying array for storage and support constant-time random-access lookup. In many situations, this makes a resizable array more efficient than an F# list, which supports efficient access only from the head (left) of the list. You can find the full set of members supported by this type in the .NET documentation. Commonly used properties and members include Add, Count, ConvertAll, Insert, BinarySearch, and ToArray. A module ResizeArray is included in the F# library; it provides operations over this type in the style of the other F# collections. Like other .NET collections, values of type ResizeArray<'T> support the seq<'T> interface. There is also an overload of the new constructor for this collection type that lets you specify initial values via a seq<'T>. This means you can create and consume instances of this collection type using sequence expressions: > let squares = new ResizeArray<int>(seq { for i in 0 .. 100 -> i*i });; val squares : ResizeArray<int> > for x in squares do printfn "square: %d" x;; square: 0 square: 1 square: 4 square: 9 ...
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CHAPTER 4 INTRODUCING IMPERATIVE PROGRAMMING
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Using Dictionaries
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The type System.Collections.Generic.Dictionary<'Key,'Value> is an efficient hash-table structure that is excellent for storing associations between values. The use of this collection from F# code requires a little care, because it must be able to correctly hash the key type. For simple key types such as integers, strings, and tuples, the default hashing behavior is adequate. Here is a simple example: > open System.Collections.Generic;; > let capitals = new Dictionary<string, string>(HashIdentity.Structural);; val capitals : Dictionary<string,string> = dict [] > capitals.["USA"] <- "Washington";; val it : unit = () > capitals.["Bangladesh"] <- "Dhaka";; val it : unit = () > capitals.ContainsKey("USA");; val it : bool = true > capitals.ContainsKey("Australia");; val it : bool = false > capitals.Keys;; val it : KeyCollection<string,string> = seq["USA"; "Bangladesh"] > capitals.["USA"];; val it : string = "Washington" Dictionaries are compatible with the type seq<KeyValuePair<'key,'value>>, where KeyValuePair is a type from the System.Collections.Generic namespace and simply supports the properties Key and Value. Armed with this knowledge, you can use iteration to perform an operation for each element of the collection: > for kvp in capitals do printf "%s has capital %s\n" kvp.Key kvp.Value;; USA has capital Washington Bangladesh has capital Dhaka val it : unit = ()
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