From: Justin Collins <collinsj@...>
Date: 2005-10-20T05:35:14+09:00
Subject: Re: require problem

It might be instructive to point out that the reason changing code_words 
to CODE_WORDS works is because variables beginning with a capital letter 
are constants and constants are accessible when you do a require.

-Justin Collins

eoghan wrote:
> Brian Schr�der wrote:
>> On 19/10/05, eoghan <ruby@redry.net> wrote:
>>> Brian Schr�der wrote:
>>>> On 19/10/05, eoghan <ruby@redry.net> wrote:
>>>>> Hello
>>>>> Im doing a simple test. I have 2 files:
>>>>> mouse.rb
>>>>> ---------
>>>>> my_string = 'blah'
>>>>>
>>>>> rabbit.rb
>>>>> ---------
>>>>> require 'foo'
>>>>>
>>>>> print my_string
>>>>>
>>>>> eoghanj$ /opt/local/bin/ruby bar.rb
>>>>> bar.rb:3: undefined local variable or method `my_string' for
>>>>> main:Object (NameError)
>>>>>
>>>>> Im simplified my example down to this; and I cant see what im doing
>>>>> wrong... hope its not too stupid.
>>>>> I read this part about irb restrictions, but im not sure it applies?
>>>>> http://www.rubycentral.com/book/irb.html
>>>>> Thanks
>>>>> Eoghan
>>>>>
>>>>>
>>>> Unlike in php or c require and load do not simply replace the
>>>> statement with the file, but are carefull not to introduce any local
>>>> variables. Try the following.
>>>>
>>>> mouse.rb
>>>> ---
>>>> module AnimalConstants
>>>>   MOUSE_NAME = "Mickey Mouse"
>>>> end
>>>>
>>>> rabbit.rb
>>>> ---s
>>>> require 'mouse'
>>>>
>>>> p AnimalConstants::MOUSE_NAME
>>>>
>>>> Constants and Globals are imported. (Note that you do not need to
>>>> structure your constants using a module, it was just to show this
>>>> effekt.)
>>>>
>>>> regards,
>>>>
>>>> Brian
>>> Thanks I understand what you are saying... however consider the
>>> following example from whys guide (and maybe im missing something here
>>> again...)
>>> http://www.poignantguide.net/ruby/chapter-4.html#section3
>>>
>>> wordlist.rb
>>> ===========================================================
>>>   code_words = {
>>>     'starmonkeys' => 'Phil and Pete, those prickly chancellors of the
>>> New Reich',
>>>     'catapult' => 'chucky go-go', 'firebomb' => 'Heat-Assisted Living',
>>>     'Nigeria' => "Ny and Jerry's Dry Cleaning (with Donuts)",
>>>     'Put the kabosh on' => 'Put the cable box on'
>>>   }
>>> ===========================================================
>>>
>>> i assume this should be saved to a file too...?
>>> ===========================================================
>>>   require 'wordlist'
>>>
>>>   # Get evil idea and swap in code words
>>>   print "Enter your new idea: "
>>>   idea = gets
>>>   code_words.each do |real, code|
>>>     idea.gsub!( real, code )
>>>   end
>>>
>>>   # Save the jibberish to a new file
>>>   print "File encoded.  Please enter a name for this idea: "
>>>   idea_name = gets.strip
>>>   File::open( "idea-" + idea_name + ".txt", "w" ) do |f|
>>>     f << idea
>>>   end
>>>
>>> This doesnt work either. For me at least. Any ideas?
>>> Eoghan
>>>
>>>
>>
>> Hello Eoghan,
>>
>> this is a known bug in _why's tutorial. It would be a good idea if it
>> were fixed in the tutorial, as this question comes up from time to
>> time on this mailing list. Change code_words to CODE_WORDS and it
>> works.
>>
>> regards,
>>
>> Brian
>>
>> -- 
>> http://ruby.brian-schroeder.de/
>>
>> Stringed instrument chords: http://chordlist.brian-schroeder.de/
>
> Thanks Brian.
>