.NET/ASP.NET/C#/VB.NET PDF Document SDK

In this case you have a Person class that implements the basic functionality of storing and returning a person s name. The Doctor class inherits from Person and overrides the name method. Within the name method for doctors, it returns a string starting with Dr., appended with the name as usual. This occurs by using super, which looks up the inheritance chain and calls the method of the same name on the next highest class. In this example, you only have two tiers, so using super within the name method in Doctor then uses the name method in Person. The benefit of using inheritance in this way is that you can implement generic functionality in generic classes, and then only implement the specific functionality that more specific child classes require. This saves a lot of repetition and means that if you make changes to the parent classes, child classes will inherit these changes too. A good example of this might be if you changed Person to take two arguments, firstname and lastname.

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Review these four slides. You show rst a simple 1-2-3 illustration that introduces and summarizes the topic. Then you show and narrate the rst headline with the rst part of the diagram and build the diagram over the next two slides. Notice that the third Explanation slide has more detail than the Key Point slide. You generally want the Key Point

In many languages a special word or character (for example, begin or {) is used to start a block, and another (such as end or }) is used to end it. In Python, a colon (:) is used to indicate that a block is about to begin, and then every line in that block is indented (by the same amount). When you go back to the same amount of indentation as some enclosing block, you know that the current block has ended. Now I m sure you are curious to know how to use these blocks. So, without further ado, let s have a look.

The Doctor class wouldn t need to be changed at all to support this change. With one child class this doesn t seem too important, but when you have hundreds of different classes in an application, it pays to cut down on repetition!

Note The concept of cutting down on repetition is commonly called DRY, meaning Don t Repeat Yourself.

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If you can code something once and reuse it from multiple places, that s usually the best way to be DRY.

Because it s a dynamic language, one clever thing you can do with Ruby is override existing classes and methods. For example, consider Ruby s String class. As covered in 3, if you create a string, you end up with an object of class String; for example:

Until now you ve only written programs in which each statement is executed, one after the other. It s time to move beyond that and let your program choose whether or not to execute a block of statements.

slide as simple as possible so that you don t overwhelm the working memory of your audience with too much new information too quickly. As you develop the diagram over the three Explanation slides, the nal slide is easy to understand because each element has been appropriately introduced both verbally and visually, piece by piece. Although this example diagram is a basic one, when you apply the same approach to other types of diagrams, you will make sure that you properly synchronize the verbal and visual channels of working memory, as described in 2. When you present your slides this way, you also align with the research-based temporal contiguity principle described in Richard E. Mayer s research, which is based on studies that show that people understand information better when animation and narration are presented together rather than animation rst and narration second.

You can call a number of different methods upon the String object stored in x:

Let s stir things up a bit by overriding the length method:

If you nd that your headlines don t quite map to the sequence in which you want to present information, return to the story template and adjust the headlines there rst, and then return to PowerPoint to edit the headlines accordingly.

Many newcomers to Ruby, even experienced developers, initially fail to believe this will work, but the results are exactly as the code dictates: