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> names.[1];; val it : string = "Sophie" > names.[2];; val it : string = "Jane" Resizable arrays use an underlying array for storage and support constant-time randomaccess lookup. This makes a resizable array more efficient than an F# list in many situations, 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 that provides operations over this type in the style of the other F# collections. Like other .NET collections, values of type ResizeArray<'a> support the seq<'a> interface. There is also an overload of the new constructor for this collection type that lets you specify initial values via a seq<'a>. 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> = [0; 1; 4; 9; ...] > for x in squares do printfn "square: %d" x;; square: 0 square: 1 square: 4 square: 9 ...

Select the worksheet cells that you want to copy or fill in, using one of the ways shown previously in Table 3-1.

In this chapter we ve presented a quick introduction to directory services. We discussed the various directory services supported by Mac OS X and talked about common directory service configurations. We also noted how directory services and managed preferences are connected----on Mac OS X, managed preferences are stored in a directory service. We ll get into the details of this in 5, Delivering Managed Preferences.

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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>();; val capitals : Dictionary <string, string> > 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. (From the F# perspective, we may have expected this type to be seq<('key * 'value)>, but tuples are not available in the .NET collection library design.) Armed with this knowledge, we can now 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 = ()

s Note Excel s fill features do not always work when multiple selected worksheet cells are not next to each

The Dictionary method TryGetValue is of special interest, because its use from F# is a little nonstandard. This method takes an input value of type 'Key and looks it up in the table. It returns a bool indicating whether the lookup succeeded: true if the given key is in the dictionary and false otherwise. The value itself is returned via a .NET idiom called an out parameter. From F# code there are actually three ways to use .NET methods that rely on out parameters: You may use a local mutable in combination with the address-of operator &. You may use a reference cell. You may simply not give a parameter, and the result is returned as part of a tuple. Here s how you do it using a mutable local: open System.Collections.Generic

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