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All the types you ve seen so far in this chapter have been immutable. For example, the values of the Vector2D types shown in Listing 6-1 and Listing 6-2 can t be modified after they re created. Frequently, you want to define mutable objects, particularly because OO programming is a generally useful technique for encapsulating mutable and evolving state. Listing 6-4 shows the definition of a mutable representation of a 2D vector. Listing 6-4. A Concrete Object Type with State type MutableVector2D(dx:float,dy:float) = let mutable currDX = dx let mutable currDY = dy member vec.DX with get() = currDX and set v = currDX <- v member vec.DY with get() = currDY and set v = currDY <- v member vec.Length with get () = sqrt (currDX * currDX + currDY * currDY) and set len = let theta = vec.Angle currDX <- cos theta * len currDY <- sin theta * len member vec.Angle with get () = atan2 currDY currDX and set theta = let len = vec.Length currDX <- cos theta * len currDY <- sin theta * len The mutable state is held in two mutable local let bindings for currDX and currDY. It also exposes additional settable properties, Length and Angle, that interpret and adjust the underlying currDX/currDY values. Here is the inferred signature for the type:

If the time delay is too annoying for you, you can reduce the number of seconds in the delay or comment out the delay method calls If you want to access the administration interface, you need to run the program using the -admin command-line switch If you are running the example from the command line, you can enter the following command: BookVendingMarchine -admin.

encapsulation boundaries. However, encapsulation can be just as important for immutable constructs, especially in larger software components. For example, the implementation of the immutable System.DateTime type in the .NET Base Class Library hides the way the date and time are stored internally but reveals the information via properties. This allows the .NET designers to adjust the implementation of this type between releases of the .NET Framework if necessary.

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type MutableVector2D = new : float * float -> MutableVector2D member DX : float with get,set member DY : float with get,set member Angle : float with get,set member Length : float with get,set You can use this type as follows: > let v = MutableVector2D(3.0,4.0);; val v : MutableVector2D > (v.DX, v.DY);; val it : float * float = (3.0, 4.0) > (v.Length, v.Angle);; val it : float * float = (5.0, 0.927295218) > v.Angle <- System.Math.PI / 6.0;; val it : unit = () // "30 degrees"

Anyone who has written anything more substantial than a Hello world program has encountered defects (bugs) in their software. Though most defects are easily found, others can be difficult to locate and correct. If you wanted to explain the concept of debugging to a novice developer, you d probably tell them it s largely a process of troubleshooting in an effort to discover what went wrong. You might also note that developing good debugging skills comes by way of mastering the appropriate debugging techniques and tools. While this may be an adequate introductory definition, you should take the time to gain a better understanding of debugging nuances. For starters, it s important that you properly frame the sort of defect you re trying to locate and correct. There are two basic types of defects: syntax errors and logic errors. Syntax errors are naturally found during the code compilation process and although they too may be difficult to correct, we are forced to correct them in order to build the software. However, logic errors are those types of errors not found during compilation and thus they are usually manifested as defects during the execution of the software. Debugging therefore is the act of finding and fixing errors in your program.

Local definitions are good for hiding most implementation details. However, sometimes you may need definitions that are local to a module, an assembly, or a group of assemblies. You can change the default accessibility of an item by using an accessibility annotation to restrict the code locations that can use a construct. These indicate what is private or partially private to a module, file, or assembly. The primary accessibility annotations are private, internal, and public: private makes a construct private to the enclosing type definition/module. internal makes a construct private to the enclosing assembly (DLL or EXE). public makes a construct available globally, which is the default for most constructs. Accessibility annotations are placed immediately prior to the name of the construct. Listing 7-3 shows how to protect an internal table of data in a module using accessibility annotations.

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