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121 lines 6165 characters 5055 characters (excluding spaces) 1093 words 18 paragraphs 45 sentences 2 sentences per paragraph (average) 24 words per sentence (average) 76% of words are non-fluff words Summary: ' The surgeon leaned over the body, and raised the left hand. Think what it is to be a mother, there's a dear young lamb do. 'The old story,' he said, shaking his head: 'no wedding-ring, I see. What an excellent example of the power of dress, young Oliver Twist was. ' Apparently this consolatory perspective of a mother's prospects failed in producing its due effect. ' The surgeon had been sitting with his face turned towards the fire: giving the palms of his hands a warm and a rub alternately. ' 'You needn't mind sending up to me, if the child cries, nurse,' said the surgeon, putting on his gloves with great deliberation. She had walked some distance, for her shoes were worn to pieces; but where she came from, or where she was going to, nobody knows. ' He put on his hat, and, pausing by the bed-side on his way to the door, added, 'She was a good-looking girl, too; where did she come from -- End of analysis

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Try analyzer.rb with some other text of your choice (a Web page, perhaps) and see if you can make improvements to its features. This application is ripe for improvement with the concepts you ll learn over the next several chapters, so keep it in mind if you re looking for some code to play with.

Tip One way to avoid that problem is to make a deep copy, copying the values, any values they contain,

You could also build the same sort of visual story across the frames of Act I by sketching a single photograph, copying it to each slide, and then sketching additional elements on each slide. If you present using a Tablet PC, sketch graphical elements directly on the photograph for more impact.

You might notice text in source code prefixed with # symbols. These are comments and are generally used in programs for the benefit of the original developer(s), along with anyone else that might need to read the source code. They re particularly useful for making notes to remind you of why you took a particular course of action that you re likely to forget in future. You can place comments in any Ruby source code file on their own lines, or even at the end of a line of code. Here are some valid examples of commenting in Ruby:

In this example you use the add_accessor_to_person method to add accessors dynamically to the Person class. Prior to using the add_accessor_to_person method, neither the name nor gender accessors exist within Person. Note that the key part of the code, the class_eval method, operates by using string interpolation to create the desired code for Person:

If you want to increase the visual impact of these Act I slides, sketch a note on the slides that you plan to hide the headlines so that only the graphics are visible to the audience. As described earlier, when you present slides without headlines, the simple graphics make the audience rely on you to describe the slides meaning, which creates an engaging interdependence between speaker and audience. This is an effective technique to use on your Act I slides while you make an emotional connection with your audience. Later, on the Act II slides, you ll usually want to keep your headlines visible to your audience to guide their attention through the much larger volume of information. Although in this example the Call to Action slide shown in Figure 7-9 was sketched as part of the group of Act I slides, be sure you visually integrate it with the important Key Point slides, as you ll do next.

Person.class_eval %Q{ attr_accessor :#{accessor_name} }

and so forth as well. You accomplish this using the function deepcopy from the copy module:

String interpolation makes the eval methods powerful tools for generating different features on the fly. This ability is a power unseen in the majority of programming languages, and is one that s used to great effect in systems such as Ruby on Rails (covered in 13). It s possible to take the previous example a lot further and add an add_accessor method to every class by putting your class_eval cleverness in a new method, defined within the Class class (from which all other classes descend):

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class Class def add_accessor(accessor_name) self.class_eval %Q{ attr_accessor :#{accessor_name} } end end

class Person end person = Person.new Person.add_accessor :name Person.add_accessor :gender person.name = "Peter Cooper" person.gender = "male" puts "#{person.name} is #{person.gender}"