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skills are sufficient often produce project deliverables that have feature and functionality issues. Although most do not suffer from fatal errors or crashes (which are often found during development), there are often issues with integration and how the software works. That is, students failed to ensure that their software worked the way the customer wanted. If this scenario is all too familiar to you, then you know the value of software testing. There are many forms of software testing used to perform a variety of quality assurance and quality control. Choosing which technique to use when is the real nature of the science of software testing.

There are other important sources of null values. For example, the semisafe function Array.zeroCreate creates an array whose values are initially null or, in the case of value types, an array each of whose entries is the zero bit pattern. This function is included with F# primarily because there is no other alternative technique to initialize and create the array values used as building blocks of larger, more sophisticated data structures such as queues and hash tables. Of course, you must use this function with care, and in general you should hide the array behind an encapsulation boundary and be sure the values of the array aren t referenced before they re initialized.

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You can add attributes to F# declarations using the [<..>] syntax For example, the SystemObsoleteAttribute marks functions as obsolete, and the F# compiler will produce a warning if the function is used: [<SystemObsolete("Don't use this one")>] let oldFunction() = printf "obsolete!\n" Exception types: Types derived from the SystemException class are used to represent raised exceptions We discussed exceptions in detail in 4 Enum types: NET enum types are simple integer-like value types associated with a particular name They are typically used for specifying flags to APIs; for example, FileMode in the SystemIO namespace is an enum type with values such as FileModeOpen and FileMode Create NET enum types are easy to use from F# and can be combined using bitwise AND, OR, and XOR operations using the &&&, |||, and ^^^ operators Most commonly, the ||| operator is used to combine multiple flags.

Note Although F# generally enables you to code in a null-free style, F# isn t totally immune to the potential

Tip If you have not had the opportunity to experience software testing firsthand or to work with a professional software tester, I recommend seeking one out. They often have incredible insight into how software works that few developers ever hone successfully. Don t be shy or embarrassed if they break your code that s their job and most are very good at it!

On occasion you may have to mask an attribute value using &&& and compare the result to Enumof_int(0) You ll see how to define NETcompatible enum types in F# at the end of 6..

existence of null values: they can come from the .NET APIs, and it s also possible to use Array.zeroCreate and other back-door techniques to generate null values for F# types. If necessary, APIs can check for this condition by first converting F# values to the obj type by calling box and then testing for null (see the F# Informal Language Specification for full details). But in practice, this isn t required by the vast majority of F# programs; for most purposes, the existence of null values can be ignored.

You may be tempted to conclude that debugging and testing are the same. Although they often have the same goal identifying defects they are not the same. Debugging is an interactive process designed to locate defects in the logic of the source code by exposing the internal workings of the source code. Testing, on the other hand, is used to identify defects in the execution of the source code without examining the inner workings of the source code.

Simple types are related in simple ways; for example, values of the type int are distinct from values of the type float, and values of one record type are distinct from values of another. This approach to types is powerful and often sufficient, partly because type inference and function values make it easy to write generic code. However, .NET and F# also support hierarchical relationships between types through subtyping. Subtyping is a key concept of object-oriented programming, and we discuss it in more detail in 6. In addition, you can use subtyping in conjunction with pure functional programming, because it offers one technique to make algorithms generic over a restricted family of types.

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