.net data matrix barcode CREATING YOUR FIRST F# PROGRAM in VB.NET

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CHAPTER 3 CREATING YOUR FIRST F# PROGRAM
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Iterating a Sequence
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You can iterate sequences using the for ... in ... do construct, as well as the Seq.iter aggregate operator discussed in the next section. Here is a simple example of the first: > let range = seq {0 .. 2 .. 6};; val range : seq<int> > for i in range do printfn "i = %d" i;; i = 0 i = 2 i = 4 i = 6 This construct forces the iteration of the entire seq. Use it with care when you re working with sequences that may yield a large number of elements.
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Transforming Sequences with Aggregate Operators
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Any value of type seq<type> can be iterated and transformed using functions in the Microsoft.FSharp.Collections.Seq module. For example: > let range = seq {0 .. 10};; val range : seq<int> > range |> Seq.map (fun i -> (i,i*i));; val it : seq<int * int> = seq [ (0, 0); (1, 1); (2, 4); (3, 9) ... ] Table 3-13 shows some important functions in this library module. The following operators necessarily evaluate all the elements of the input seq immediately: Seq.iter: This iterates all elements, applying a function to each one. Seq.toList: This iterates all elements, building a new list. Seq.toArray: This iterates all elements, building a new array.
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Most of the other operators in the Seq module return one or more seq<type> values and force the computation of elements in any input seq<type> values only on demand.
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CHAPTER 3 CREATING YOUR FIRST F# PROGRAM
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Table 3-13. Some Important Functions and Aggregate Operators from the Seq Module
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Operator
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Seq.append Seq.concat Seq.choose Seq.delay Seq.empty Seq.iter Seq.filter Seq.map Seq.singleton Seq.truncate Seq.toList Seq.ofList Seq.toArray Seq.ofArray
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Type
: seq<'T> -> seq<'T> -> seq<'T> : seq< seq<'T> > -> seq<'T>
: ('T -> 'U option) -> seq<'T> -> seq<'U> : (unit -> seq<'T>) -> seq<'T> seq<'T> : ('T -> unit) -> seq<'T> -> unit : ('T -> bool) -> seq<'T> -> seq<'T> : ('T -> 'U) -> seq<'T> -> seq<'U> : 'T -> seq<'T> : int -> seq<'T> -> seq<'T> : seq<'T> -> 'T list : 'T list -> seq<'T> : seq<'T> -> 'T[] : 'T[] -> seq<'T>
Which Types Can Be Used as Sequences
Table 3-13 includes many uses of types such as seq<'T>. When a type appears as the type of an argument, the function accepts any value that s compatible with this type. 5 explains the notions of subtyping and compatibility in more detail; the concept should be familiar to OO programmers because it s the same as that used by other .NET languages such as C#, which itself is close to that used by Java. In practice, you can easily discover which types are compatible with which by using F# Interactive and tools such as Visual Studio: when you hover over a type name, the compatible types are shown. You can also refer to the online documentation for the F# libraries and the .NET Framework, which you can easily search using the major search engines. Here are some of the types compatible with seq<'T>: Array types: For example, int[] is compatible with seq<int>. F# list types: For example, int list is compatible with seq<int>. All other F# and .NET collection types: For example, System.Collections.Generic.SortedList<string> is compatible with seq<string>.
The following types aren t directly type compatible with seq<'T> but can be converted readily into sequences when needed:
CHAPTER 3 CREATING YOUR FIRST F# PROGRAM
Some .NET types are compatible with a somewhat deprecated nongeneric .NET 1.0 construct called System.Collections.IEnumerable (note the absence of any generic parameter) but aren t compatible with the newer .NET construct System.Collections.Generic.IEnumerable<type>, called seq<type> in F# code. Some .NET types such as System.Text.RegularExpressions.MatchCollection support only a GetEnumerator method and can t be used directly as values of type seq<type>. However, you can convert them into sequences by using them in conjunction with the sequence expression syntax mentioned earlier, such as seq { for x in matchCollection -> x } or for x in matchCollection do ....
Expressions of the form for pat in seq are described in the section Using Sequence Expressions and in 4.
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