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Well, I just couldn t help myself it sounded like the job for me and in May, 2007, Foundations of F# was published About half a year later, it was announced that F# would be productized and made available as part of Visual Studio 2010 This seemed too good an opportunity to miss so I signed up to write a new version of the book, with the ambition of documenting the language as it is in Visual Studio 2010 The result is the book you are holding in your hands It has been great fun watching F# evolve and turn from a rudimentary language into the fully fledged and highly usable tool you see today I hope reading this book changes your life as much as writing it changed mine..

the Browsable(False) attribute, as described in Table 13-1.

This code declares x, which is a state, and then adds a value of 1 to x, which is an example of modifying state using operations Of course, this seems a bit obvious after all, if you want to solve a problem, you need to modify state Let s see an example of imperative programming creating side effects: class SomeObject { public int Value; } class AnotherObjectThatEmbedsSomeObject { SomeObject _child; public AnotherObjectThatEmbedsSomeObject(SomeObject child) { _child = child; } void MyMethod() { _childValue = 10; } } Suppose you have this method: void SomeMethod(AnotherObjectThatEmbedsSomeObject obj) { objMyMethod(); } Here, calling MyMethod() causes the side effect of SomeObjectValue being changed to 10 In 6, I demonstrated that this type of code is very good, because it hides information and lets the type AnotherObjectThatEmbedsSomeObject focus on manipulating SomeObject without interference.

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The enumerated values are shown in the Properties window (see Figure 13-12).

Note Remember, even if you use an enumerated value, you still need to perform some error-checking in your property procedure. Though programmers won t be able to submit an invalid value through the Properties window, nothing prevents them from using code to directly set an integer value that doesn t correspond to a valid value in the enumeration.

This introductory chapter will address some of the major questions you may have about F# and functional programming.

Yet that goodness is a double-edged sword, in that it causes side effects that the caller of SomeMethod() does not know about (Of course, one could argue that AnotherObjectThatEmbedsSomeObject should have been made thread-aware, but this example is for illustrative purposes) The component-oriented imperative approach, in theory, lets you build an infrastructure that you can use to solve many problems Let s say that you are going to repaint and repair a house You could surround the house with scaffolding, and then let the repairmen and painters fix the house Having scaffolding is safer, but the workers must watch out for other people when walking on the scaffolding And on top of that, putting up and taking down the scaffolding takes time The scaffolding is like the imperative language approach, where you need to worry about many things, including concurrency.

What you probably don t realize is that you can supply a drop-down list of standard values for any control properties, even if it s not an enumeration. In fact, this trick is made possible with a custom type converter. It all works through three overridable type converter methods that you haven t seen. The most important is GetStandardValues(), which returns a StandardValuesCollection (a type nested in TypeConverter from the System.ComponentModel namespace) that contains a list

of all the items you want to show in the drop-down However, for Visual Studio to use this functionality, you also need to override GetStandardValuesSupported() and return True Finally, if you want property settings to be limited to the list in other words, you don t want the developer to supply a value that isn t in your standard value list at design time you need to override GetStandardValuesExclusive() and return True To demonstrate how this works, the following example creates a type converter that shows a list of drive letters for the DirectoryDrive property Because the Drive property is really just a char, there s no need to waste time reimplementing the ConvertTo() and ConvertFrom() methods in the type converter Instead, your custom type converter can derive directly from CharConverter (The NET Framework includes type converters for all common data types.

Alternatively, you could let the painters and repairmen run around the house with ladders The ladders are quicker to put up and take down, and allow each individual to work independently The downside of using ladders is that workers must move the ladders whenever they want to do something and must worry about where to place the ladder, as well as figure out how to fix and paint the house This is analogous to the functional language approach Writing code that has no side effects is possible, but it comes with a direct conflict to imperative programming Avoiding all side effects would require writing code where everything is stored on the stack, and that simply is not always possible and probably quite confusing Imperative and.

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