Require problem

ruby-talk
1

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

2

If you mean your are requiring 'mouse' in rabbit, then my_string would be considered a variable local to 'mouse'

-Justin

eoghan 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

3

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

···

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

---
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

--
http://ruby.brian-schroeder.de/

Stringed instrument chords: http://chordlist.brian-schroeder.de/

4

Brian Schröder 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

5

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

···

On 19/10/05, eoghan <ruby@redry.net> wrote:

Brian Schröder 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

--
http://ruby.brian-schroeder.de/

Stringed instrument chords: http://chordlist.brian-schroeder.de/

6

Brian Schröder wrote:

···

On 19/10/05, eoghan <ruby@redry.net> wrote:

Brian Schröder 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.

7

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 Schröder wrote:

On 19/10/05, eoghan <ruby@redry.net> wrote:

Brian Schröder 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.