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The .NET documentation and other .NET languages often describe types as either reference types or value types. We can use System.String and System.DateTime as a typical example of each. First note that both of these types are immutable. That is, given a value of type System.String, you cannot modify the contents of the string; the same is true for System.DateTime. This is by far the most important fact you need to know about these types: for immutable types the reference/ value type distinction is relatively unimportant. However, it is still useful to know the following: Representation: Values of type System.String are single pointers into the garbage-collected heap where the actual data for the string resides. Two System.String values may point to the same data. In contrast, values of type System.DateTime are somewhat larger blobs of integer data (64-bits of data in this case), and no data lives on the garbage-collected heap. The full data for the value is copied as needed. Boxing: All .NET types can be marshaled to and from the .NET type System.Object (the F# type obj) by using F# functions such as box and unbox. All reference types are trivially marshaled to this type without any change of representation or identity, so for reference types, box is a noop. Boxing a value type involves a heap allocation, resulting in a new object. Often this object is immediately discarded after the operation on the obj type has been performed.

The keyword null is used in imperative programming languages as a special, distinguished value of a type that represents an uninitialized value or some other kind of special condition. In general, null isn t used in conjunction with types defined in F# code, although it s common to simulate null with a value of the option type. For example: > let parents = [("Adam",None); ("Cain",Some("Adam","Eve"))];; val parents : (string * (string * string) option) list = ... However, reference types defined in other .NET languages do support null; when using .NET APIs, you may have to explicitly pass null values to the API and also, where appropriate, test return values for null. The .NET Framework documentation specifies when null may be returned from an API. It s recommended that you test for this condition using null pattern tests. For example: match System.Environment.GetEnvironmentVariable("PATH") with | null -> printf "the environment variable PATH is not defined\n" | res -> printf "the environment variable PATH is set to %s\n" res

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I often get asked this question whenever I lecture about software quality issues. Some students want to how much testing is enough. To those who feel testing is largely a waste of time or highly overrated, I offer them the opportunity to complete their software engineering class projects1 using a minimal (or sometimes no) testing strategy. The results are often interesting and enlightening. The students often speak of how well they code their modules and classes and how careful they are to use good modeling practices. Many use Unified Modeling Language (UML) diagrams to assist their development. While these are good practices, testing involves a lot more than making sure your source code matches your model. Students who insist that their highly honed coding

If a value can be mutated, then the distinction between value types and reference types is more serious. Fortunately, essentially all mutable values in the .NET libraries are reference types, which means mutation actually mutates the heap-allocated data referred to by the reference.

The following is a function that incorporates a pattern type test and a null-value test: let switchOnType (a:obj) = match a with | null | : System.Exception as e | : System.Int32 as i | : System.DateTime as d | _

1. Which normally include large semester-long group projects beginning with requirements elicitation.

The NET type system makes some additional distinctions between types that are occasionally significant for F# programming We briefly summarize these here: Delegate types: Delegate types such as SystemWindowsFormsMouseEventHandler are a form of named function type supported by all NET languages They tend not to be as convenient to use as F# function types, since they do not support compositional operations such as pipelining and forward composition However, NET APIs use delegates extensively To create a delegate value, you name the delegate type and pass it a function value accepting the same arguments as expected by the delegate type, such as MouseEventHandler(fun sender args -> printf "click!\n") Attribute types: Types derived from the SystemAttribute class are used to add metadata to source code declarations and typically end in the suffix Attribute You can access these attributes via NET and F# reflection.

"null!" "An exception: %s!" e.Message "An integer: %d!" i "A date/time: %O!" d "Some other kind of object\n"

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