vb.net data matrix code WORKING WITH OBJECTS AND MODULES in Visual Basic .NET

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CHAPTER 6 WORKING WITH OBJECTS AND MODULES
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Let s look at the implementation of the Length property: member v.Length = sqrt(v.DX * v.DX + v.DY * v.DY) Here, the identifier v stands for the Vector2D value on which the property is being defined. In many other languages, this is called this or self, but in F# you can name this parameter as you see fit. The implementation of a property such as Length is executed each time the property is invoked; in other words, properties are syntactic sugar for method calls. For example, let s repeat the earlier type definition with an additional property that adds a side effect: member v.LengthWithSideEffect = printfn "Computing!" sqrt(v.DX * v.DX + v.DY * v.DY) Each time you use this property, you see the side effect: > let x = {DX = 3.0; DY=4.0 };; val x : Vector2D > x.LengthWithSideEffect;; Computing! val it : float = 5.0 > x.LengthWithSideEffect;; Computing! val it : float = 5.0 The method members for a type look similar to the properties but also take arguments. For example, let s look at the implementation of the ShiftX method member: member v.ShiftX(x) = { v with DX=v.DX+x } Here the object is v, and the argument is dx. The return result clones the input record value and adjusts the DX field to be v.DX+dx. Cloning records is described in 3. The ShiftXY method member takes two arguments: member v.ShiftXY(x,y) = { DX=v.DX+x; DY=v.DY+y } Like functions, method members can take arguments in either tupled or iterated form. For example, you could define ShiftXY as follows: member v.ShiftXY x y = { DX=v.DX+x; DY=v.DY+y } However, it s conventional for methods to take their arguments in tupled form. This is partly because OO programming is strongly associated with the design patterns and guidelines of the .NET Framework, and arguments always appear as tupled when using .NET methods from F#. Discriminated unions are also a form of concrete type. In this case, the shape of the data associated with a value is drawn from a finite, fixed set of choices. Discriminated unions can also be given members. For example:
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CHAPTER 6 WORKING WITH OBJECTS AND MODULES
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/// A type of binary trees, generic in the type of values carried at nodes and tips type Tree<'T> = | Node of 'T * Tree<'T> * Tree<'T> | Tip /// Compute the number of values in the tree member t.Size = match t with | Node(_,l,r) -> 1 + l.Size + r.Size | Tip -> 0
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Should You Use Members or Functions
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F# lets you define both members associated with types and objects via the dot-notation and static functions that can perform essentially the same operations. For example, the length of a string s can be computed by both the s.Length property and the String.length function. Given the choice, which should you use in your code Although there is no fixed answer to this, here are some general rules: Use members (methods and properties) where they already exist, unless you have other good reasons not to do so. It s better to use s.Length than String.length, simply because it s shorter, even if it occasionally requires using an additional type annotation. That is, embrace dot-notation, but use it tastefully. When designing a framework or library, define members for the intrinsic, essential properties and operations associated with a type. When designing a framework or library, define additional functionality in new modules or by using extension members. The section Extending Existing Types and Modules later in this chapter covers extension members. Sometimes there is duplication in functionality between dot-notation members and values in associated modules. This is intended and should be accepted as part of the mixed OO/functional nature of F#.
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