From: Ilias Lazaridis <ilias@...>
Date: 2005-03-21T02:59:53+09:00
Subject: Re: [EVALUATION] - E03 - jamLang Evaluation Case Applied to Ruby

Martin DeMello wrote:
> Ilias Lazaridis <ilias@lazaridis.com> wrote:
> 
>>The above thread showed finally the need to split the evaluation down
>>into smaller chunks.
>>
>>Here is a simple evaluation template (first part) which can be applied 
>>to the Ruby language:
>>
>>http://lazaridis.com/case/lang/index.html
> 
> Okay, that's a neat bit of work. Here's a quick solution (ruby makes
> most of this fairly trivial):

I apologize for the late answer.

> # here's your basic talker class
> 
> class Talker
>   def sayHello
>     puts "Hello world"
>   end
> end

ok

> # __FILE__ == $0 means that the program is being run directly
> # rather than 'require'd from another file
> 
> if __FILE__ == $0
>   talker = Talker.new
>   talker.sayHello
> end

Assuming I placethe code into the file "talker.rb".

from the command-line, i like to start it, e.g. with "ruby talker.rb"

I miss a "main" directive / function / object.

something like:

def main
    talker = Talker.new
    talker.sayHello
end

> # one-pass interpreter, and you can reopen classes
> # so let's just continue

[sidenote: I don't understand this]

> # here are the two instance variables added to the class, complete with
> # autogenerated getters and setters

very nice!

> class Talker
>   attr_accessor :name, :age

can I write?:

attr_accessor :name
attr_accessor :age

 >   def initialize(name, age)
 >     @name, @age = name, age
 >   end

Is this the constructor?

I assume I can write

    def initialize(name, age)
      @name = name
      @age  = age
    end

>   # following the spec, though say_name is more rubyish
>   def sayYourName
>     puts @name
>   end

can I write?: def sayYourName puts @name end

>   def sayYourAge
>     puts @age
>   end
> end

ok

> # now note that our object 'talker' has access to the new methods in its
> # class
> 
> if __FILE__ == $0
>   # note that we aren't breaking encapsulation and accessing the vars directly;
>   # the setter methods are called name= and age=, and the getters are called
>   # name and age

very(!) nice!

>   talker.name = "Just another talker"
>   talker.age = 1
>   talker.sayYourName
>   talker.sayYourAge
> end

ok

> # reflection
[...]

seperate message will follow.

..

-- 
http://lazaridis.com