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Like methods, properties can take arguments; these are called indexer properties. The most commonly defined indexer property is called Item, and the Item property on a value v is accessed via the special notation v.[i]. As the notation suggests, these properties are normally used to implement the lookup operation on collection types. The following example implements a sparse vector in terms of an underlying sorted dictionary: open System.Collections.Generic type SparseVector(items: seq<int * float>)= let elems = new SortedDictionary<_,_>() do items |> Seq.iter (fun (k,v) -> elems.Add(k,v)) /// This defines an indexer property member t.Item with get(idx) = if elems.ContainsKey(idx) then elems.[idx] else 0.0 You can define and use the indexer property as follows: > let v = SparseVector [(3,547.0)];; val v : SparseVector > v.[4];; val it : float = 0.0 > v.[3];; val it : float = 547.0 You can also use indexer properties as mutable setter properties with the syntax expr.[expr] <expr. This is covered in the section Defining Object Types with Mutable State. Indexer properties can also take multiple arguments; for example, the indexer property for the F# Power Pack type Microsoft.FSharp.Math.Matrix<'T> takes two arguments. 10 describes this type.

helyx:~ hunterbj$ codesign -dvvvv /Applications/Camino.app /Applications/Camino.app: code object is not signed

Types can also include the definition of overloaded operators. Typically, you do this by defining static members with the same names as the relevant operators. Here is an example: type Vector2DWithOperators(dx:float,dy:float) = member x.DX = dx

You set up fan pages through the Ads and Pages application. If you don t have any pages, search for Ads and Pages from within Facebook. I d suggest using a desktop browser to get this set up. The advantage of using a fan page is that you can make a fan page an official company presence without needing to be friends with any of the fans of the page. The disadvantage is that you do not see the activity fans generate anywhere outside of that page. Whether or not you want your business contacts mingling with your classmates

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Now, look at the first two lines of the function wordCount in Listing 2-1. These lines define the function wordCount and the local value words, both using the keyword let: let wordCount (text: string) = let words = ... let is the single most important keyword you use in F# programming: it s used to define data, computed values, functions, and procedures. The left of a let binding is often a simple identifier but can also be a pattern. (See the Using Tuples section for examples.) It can also be a function name followed by a list of argument names, as in the case of wordCount, which takes one argument: text. The right of a let binding (after the =) is an expression.

In summary, application signing shows true promise to combat application poisoning and help developers to provide legitimacy to their application. However, the realization is that as of 10.6, application signing s enforcement in OS X is relatively minimal. Most notably, users are not warned if they launch an application whose contents have been modified! The honest truth is that users commonly identify applications based upon their filename, or even their icon. Anything that happens beyond the screen is simply magic: they click on the blue W and expect to see a word processor. The issue here, is that with the state of the system, 10.6 simply doesn t have the enforcement facilities to truly protect users like this. What is needed is for Apple to provide a clear and concise UI that can warn users if their applications are suspect. Such a system is simply just not available in the Mac OS today.

In other languages, a local value is called a local variable. However, in F#, you can t change the immediate value of locals after they ve been initialized unless the local is explicitly marked as mutable, a topic we return to in 4. For this reason, F# programmers and the language specification tend to prefer the term value to variable. As you ll see in 4, data indirectly referenced by a local value can still be mutable even if the local value isn t; for example, a local value that is a handle to a hash table can t be changed to refer to a different table, but the contents of the table itself can be changed by invoking operations that add and remove elements from the table. But many values and data structures in F# programming are completely immutable; in other words, neither the local value nor its contents can be changed through external mutation. These are usually just called immutable values. For example, all basic .NET types such as 9

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