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CHAPTER 4 I IMPERATIVE PROGRAMMING
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let fsDateList [ { year = { year = { year =
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= 1999 ; month = 12; day = 31 }; 1999 ; month = 12; day = 31 }; 1999 ; month = 12; day = 31 } ]
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List.iter (fun d -> print_int d.year) fsDateList fsDateList |> List.iter (fun d -> print_int d.year) Although this code is virtually the same as the previous example, it will compile without error. This is because the compiler can infer that the parameter d is of type date from the use of date s year field. It is important to remember that both cases work here, so although the forward operator isn t quite as useful when working with F# s record types and its union type, you can still use it. In fact, you should consider using it even when working with F# types, because this will lead to working with both external .NET types and F# types in a consistent manner. The forward operator > operator > operator is also incredibly useful when trying to chain functions together, that is, when one function operates on the result of another. Consider the next example, where you obtain a list of all the .NET assemblies in memory and then process this list until you end up with a list of all the .NET methods in memory. As each function operates on the result of the previous function, the forward operator is used to show the results being piped or passed forward to the next function. You don t need to declare intermediate variables to hold the results of a function. #light let methods = System.AppDomain.CurrentDomain.GetAssemblies() |> List.of_array |> List.map ( fun assm -> assm.GetTypes() ) |> Array.concat |> List.of_array |> List.map ( fun t -> t.GetMethods() ) |> Array.concat print_any methods You ll use this technique throughout the rest of the book, particularly when you cover data access in 9.
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Summary
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In this chapter, you learned about the imperative features of F#. Combined with the functional features in 3, you now have a full range of techniques to attack any computing problem. F# allows you to choose techniques from the appropriate paradigm and combine them whenever necessary. In the next chapter, you ll see how F# supports the third programming paradigm, object-oriented programming.
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CHAPTER
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Object-Oriented Programming
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bject-oriented programming is the third major programming paradigm. At its heart, object-oriented programming has a few simple ideas, some of which you ve already encountered. Possibly the most important idea is that the implementations and state should be encapsulated, that is, hidden behind well-defined boundaries. This makes the structure of a program easier to manage. In F#, things are hidden by using signatures for modules and type definitions and also by simply defining them locally to an expression or class construction (you ll see examples of both in this chapter). The second idea is that you can implement abstract entities in multiple ways. In OOP this is known as polymorphism. You ve met a number of simple abstract entities already, such as function types. A function type is abstract because a function with specific type can be implemented in many different ways; for example, the function type int -> int can be implemented as a function that increments the given parameter, a function that decrements the parameter, or any one of millions of mathematical sequences. Other abstract entities can be built out of existing abstract components such as the interface types defined in the .NET BCL. More sophisticated abstract entities are modeled using user-defined interface types. Interface types have the advantage that they can be arranged hierarchically; this is called interface inheritance. For example, the .NET BCL includes a hierarchical classification of collection types, available in the System.Collections and System.Collections.Generic namespaces. In OOP you can sometimes arrange implementation fragments hierarchically. This is called implementation inheritance. This tends to be less important in F# programming because of the flexibility that functional programming provides for defining and sharing implementation fragments. However, it is significant for domains such as graphical user interface (GUI) programming.
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