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rather than variables. Hard-coded parameters can also be numeric or any other value that is compiled into the sources. Hard-coded parameters can be problematic when the same value is used in multiple places. If you want to change the value that is used multiple times, you need to find each and every occurrence, and then change the text.

Invoked when the property is edited. Generally, this is where you would create a special dialog box for property editing. Specifies whether the type editor is a DropDown (provides a list of specially drawn choices), Modal (provides a dialog box for property selection), or None (no editing supported). Use this to return True if you are providing a PaintValue() implementation. Invoked to paint a graphical thumbnail that represents the value in the Properties window.

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Using classes from non-F# libraries is also straightforward The syntax for instantiating an object consists of the keyword new, name of the class you want to instantiate, and then constructor arguments separated by commas within parentheses You can use the let keyword to bind an instance of a class to an identifier Once associated with an identifier, the object behaves a lot like a record type; the object referred to cannot be changed, but its contents can Also, if the identifier is not at the top level, then it can be redefined or hidden by an identifier of the same name in another scope C# and Visual Basic programmers should find accessing fields, properties, events, and methods should be intuitive because the syntax is similar To access any member, you use the identifier of the object followed by a period () and then the name of the member.

GetPaintValueSupported() PaintValue()

You could convert the first parameter into a variable that can be referenced at various locations, like this: string surrounding = "+++"; expression(surrounding, "hello"); Writing code using parameters is not a problem. However, now you need to drag around a common parameter, and that can become very inconvenient. You want to build a buffer, but you don t want to be bothered with the details of how to do the buffer modifications. This is why object-oriented programming became popular. Object-oriented programming lets you drag around a simple object reference that knows how to manage the details. In functional programming, the approach that you can use is to curry a function. You create a function that has a state and that will call your desired method properly. To create a curried function, use the following lambda expression. surrounding => core => surrounding + " " + core + " " + surrounding; This lambda expression looks scary, but it is rather simple if you look at the anonymous method version: delegate (string surrounding) { return delegate (string core) { return surrounding + " " + core + " " + surrounding; }; }; You are creating an anonymous method within an anonymous method, which creates two levels of calls, or a higher-level function, as is characteristic of functional programming. When dealing with lambda expressions that return lambda expressions, the definition of the lambda expression can be a bit tricky. The complete declaration of the curried function is as follows: Func<string, Func<string, string>> curry = surrounding => core => surrounding + " " + core + " " + surrounding; You pass in a string value and receive a lambda expression that accepts a string value and returns a string value. You can call the curried function as follows: curry("+++")("hello");

A modal type editor shows an ellipsis (...) button next to the property value. When this button is clicked, a dialog box appears that allows the developer to change the property value (see Figure 13-15).

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