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You often have to choose whether to use modules or OO dot-notation to organize your code. Here are some of the rules for using these to organize your code effectively and to lay the groundwork for applying good .NET library and framework design principles to your code: Use modules when prototyping and to organize scripts, ad hoc algorithms, initialization code, and active patterns. Use concrete types (records, discriminated unions, and class types) to implement concrete data structures. In the long term, plan on completely hiding the implementation of these types. You see how to do this in 7. You can provide dot-notation operations to help users access parts of the data structure. Avoid revealing other representation details. Use object interface types for types that have several possible implementations. Implement object interface types by private concrete types or by object expressions. In polished libraries, most concrete types exposed in an implementation should also implement one or more object interface types. For example, collections should implement IEnumerable<'T>, and many types should implement IDisposable (see 8 for more details on IDisposable). Avoid relying on or revealing complex type hierarchies. In particular, avoid relying on implementation inheritance, except as an internal implementation technique or when doing GUI programming or authoring very large objects. Avoid nesting modules or types inside other modules or types. Nested modules and types are useful implementation details, but they re rarely made public in APIs. Deep hierarchical organization can be confusing; when you re designing a library, you should place nearly all public modules and types immediately inside a well-named namespace.

Note .NET assemblies often contain quite a large amount of code. For example, a single assembly might contain as many as 50 or 100 F# source code files. Having many small assemblies may seem tempting, such as to improve compilation times during development, but can lead to difficulties when managing updates and can be confusing to end users. Large assemblies are easier to version: you have to update only one component, and you can package multiple updates into a single new version of the DLL.

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Figure 5-2. Better error handler example Error handlers aren t just for reporting errors. There is another construct that is also called an error handler. This construct is simply the code used to trap and process (handle) errors. Perhaps you are familiar with the C++ try...catch block. This is an excellent example of an error handler as the language has been modified to include the construct in its syntax. Listing 5-3 depicts a typical try...catch block. The example shows the basic syntax for the C++ error handler (also called an exception handler).

The final topic covered in this chapter is how you can define ad hoc dot-notation extensions to existing library types and modules. This technique is used rarely but can be invaluable in certain circumstances. For example, the following definition adds the member IsPrime. You see uses of this technique in 13:

Small programs are often used as both interactive scripts and as small compiled applications. Here are some useful facts to know about scripting with F# and F# Interactive: Small F# scripts use the extension .fsx. You can use the scripting directive #load from F# Interactive to load and compile one or more source code files as if they had been compiled using the command-line compiler. You can load one script from another script by the F# Interactive directive #use. This is very much like #load except that the file being loaded may contain further scripting directives.

Listing 5-3 Example C++ Error Handler try catch Block try { //attempt file operation here } catch (CFileException* e) { //handle the exception here } While Listing 5-3 is less sophisticated than the C++ construct, you can create error handlers in just about any language that supports conditional statements For example, Listing 5-4 shows an example from the C language Here, we see the return code is checked and, depending on the failure, the code handles the problem Take care when creating error handlers from scratch You want to be sure to cover all possible conditions so that you can successfully recover or at least process the error in a way that does not affect the performance of the system and (more importantly) loss or corruption of data Listing 5-4.

module NumberTheoryExtensions = let isPrime i = let lim = int (sqrt (float i)) let rec check j = j > lim || (i % j <> 0 && check (j+1)) check 2 type System.Int32 with member i.IsPrime = isPrime i The IsPrime property is then available for use in conjunction with int32 values whenever the NumberTheoryExtensions module has been opened. For example: > open NumberTheoryExtensions;; > (3).IsPrime;; val it : bool = true > (6093711).IsPrime;; val it : bool = false Type extensions can be given in any assembly, but priority is always given to the intrinsic members of a type when resolving dot-notation.

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