Re: Explaining this simple method code

On Fri, Jul 27, 2012 at 10:39 PM, Ruby Sea <[e-mail]> wrote:
> Hello,
>
> I wanted to make a small command line script in Ruby. User inputs name
> of Restaurant and type and average price. gets results for these add
> info
>
> a guy helped me to write simple class. I have tow questions from the
> code below:
>
> class Restaurant
>  attr_accessor :name :type :avg_price
>  def initialize(name, type, avg_price)
>    @name = name
>    @type = type
>    @avg_price = price
>  end
>  end
>
>
> If we created the attr_accessors for the type, and price, and name
> Why we need to use the Initialize method? because we need to set the
> inputed values to it?

You need #initialize only if you want to be able to set those values
during initialization.  Otherwise you can as well create the instance
and set values then:

r = Restaurant.new
r.name = "foo"
r.type = "Italian"
r.avg_price = 14

Btw,, you can also use Struct here

Restaurant = Struct.new :name, :type, :avg_price

Now you have a class Restaurant with the same accessor methods (and a
bit more, please see documentation).

> second question please:
>
> in the code also i have a sub class called RestaurantList followed by <
> Array
> It seems to me it is a subclass. but the Array class doesn't exist in
> the code? is it a built in class in ruby called Array? what it does
> exactly?

http://rubydoc.info/stdlib/core/Array

> Please make your answers as simple as you can make it so i can
> understand it easily.

Well, you will have to invest some amount of effort if you want to
learn the language or to program at all.  You can find more
documentation and also introductory material here:
http://www.ruby-lang.org/en/documentation/

Kind regards

robert


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