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Finishing first, the procedural programmer is sure his code will be chosen. The object-oriented programmer takes longer. He recognizes that the specifications might change in the future, and that it would be useful to define a Shape class and then create classes that would inherit from Shape. This would mean that if extra features needed to be added to shapes in general, the code would be ready. He submits his initial solution: class Shape end class Square < Shape def initialize(side_length) @side_length = side_length end def area @side_length * @side_length end def perimeter @side_length * 4 end end class Triangle < Shape def initialize(base_width, height, side1, side2, side3) @base_width = base_width @height = height

@side1 = side1 @side2 = side2 @side3 = side3 end def area @base_width * @height / 2 end def perimeter @side1 + @side2 + @side3 end end

in the Name text box, and stick with the default Define in option, which is to define the style in the current document. Your dialog box should look like Figure 9-15. Click OK.

Note This code might seem complex and alien at this time, but we ll be covering the techniques used

Figure 7-8. Visual Studio view of the new MfgComponentModel project, showing References and MfgComponentModel.m

here later in this chapter. For now, simply recognize the structure of laying down classes and methods, as covered in 2.

The procedural programmer scoffs at the object-oriented solution. Why all the pointless assignments of data he mocks. That object-oriented code is 90 percent structure and 10 percent logic! The boss is impressed by the shortness of the procedural code, but decides to try out both versions for himself. He quickly spots a big difference: puts area_of_triangle(6,6) puts perimeter_of_square(5) 18 20 my_square = Square.new(5) my_triangle = Triangle.new(6, 6, 7.81, 7.81, 7.81) puts my_square.area puts my_square.perimeter puts my_triangle.area puts my_triangle.perimeter 25 20 18 23.43

At this point, you may notice a few changes: The Objects and Timeline panel now contains the style object, but all of the form objects are no longer visible. At the top of the Objects and Timeline panel, you will see an up arrow with the text TextBoxStyle (TextBox Style) to its right. If you hover the mouse over the arrow, you will see a message that reads Return scope to [UserControl], as shown in Figure 9-16. Clicking this arrow will return you to the Objects and Timeline panel that you have grown used to, with the different form objects showing.

Working with CSV is easy, but it doesn t feel very smooth. You re always dealing with arrays, so rather than getting nice names such as name, age, or job for the different attributes, you have to remember in which element and at which position each attribute is located. You re also forced to store simple arrays for each separate entry. There s no nesting, no way to relate one thing to another, no relationship to object orientation, and the data is flat. This is sufficient for basic data, but what if you simply want to take data that already exists in structures like arrays and hashes and save that data to disk for later use

PStore is a core Ruby library that allows you to use Ruby objects and data structures as you normally would, and then store them in a file. Later on, you can reload the objects back into memory from the disk file. This technique is known as object persistence, and relies on a technique called marshalling, where standard data structures are turned into a form of flat data that can be stored to disk or transmitted over a network for later reconstruction. Let s create a class to represent the structure of the data you were using in the CSV examples: class Person attr_accessor :name, :job, :gender, :age end

You can re-create your data like so: fred = Person.new fred.name = "Fred Bloggs" fred.age = 45 laura = Person.new laura.name = "Laura Smith" laura.age = 23

A new breadcrumb appears at the top of the artboard, as shown in Figure 9-17. The breadcrumb provides another way for you to navigate back to normal design mode.

How do you get from the model code shown in Figure 7-8 to the desired end shown in Figure 7-3 Let s work from the top down and add the two import declarations for Repository.Item and System (see Figure 7-9).