From: Phlip <phlip2005@...>
Date: 2008-12-31T06:09:30+09:00
Subject: Re: Ruby Noobie needs some help

r wrote:

> Hello,
> I am coming from the python world and trying to learn ruby. Why does
> this throw an error?
> 
> #testscript.rb
> cams = ['cam1', 'cam2', 'cam3']
> def function(s)
>     puts s
>     for x in cams
>         print x
>     end
> end
> test()

Where is function 'test()'?

(Note that my e-mails use 'single ticks' for code samples - don't type the ticks!)

Next, I think that 'function()' cannot see 'cams' because it's in the wrong 
scope. If you want it to be constant, capitalize it, 'Cams', so it gets a wider 
scope, and the called function can see it.

> In python this is perfectly valid, must i write a class for
> everything?

I direct your attention to the myriad Ruby tutorials, which exclaim proudly that 
- unlike Java - you don't need to write any class if you don't want one.

(Ruby is still fully OO - the trick is you are inside a default class - I think 
it's 'Kernel'.)

 > Also how does ruby handle modules compared to python? In
> python i can do "import testscript" and access the function and array
> as...
> py> testscript.function('hello')
> py> testscript.cams[0]

You 'require "testscript"', and your 'function()' is available without 
decoration. If you want it, you put 'module Testscript'

> I can also do "from testscript import cams, function" and then do
> py> cams[0]
> py> function('hello')

Then you would 'include Testscript' somewhere in the including module.

 From here, please crack a book. You will find Ruby infinitely superior to 
programmer-hostile systems like Java or Perl, and you will find it competes, 
feature-by-feature, with irritating systems like Python...

> Does anybody know of a good Python2Ruby.tut() ??

Did Google help? I know there's a Java-to-Ruby tutorial out there...

-- 
   Phlip