From: Joel VanderWerf <vjoel@...>
Date: 2005-12-19T07:46:24+09:00
Subject: Re: Newbie: require 'filename' - undefined local variable or method...

Ezra Zygmuntowicz wrote:
> 
> On Dec 18, 2005, at 2:27 PM, Grehom wrote:
> 
>> Thanks Gene and Ezra, I tried your suggestions but with no luck.  I
>> modified the main program 'mainprog.rb' as follows:
>>    puts $:
>>    load("stuff.rb", wrap=false)
>>    puts myhash["a"]
>>
>> This produced following output:
>>   C:\rubysrcs>ruby mainprog.rb
>>     c:/ruby/lib/ruby/site_ruby/1.8
>>     c:/ruby/lib/ruby/site_ruby/1.8/i386-msvcrt
>>     c:/ruby/lib/ruby/site_ruby
>>     c:/ruby/lib/ruby/1.8
>>     c:/ruby/lib/ruby/1.8/i386-mswin32
>>     .
>>     mainprog.rb:5: undefined local variable or method `myhash' for
>> main:Object (NameError)
>>
>> and it seems the pwd '.' is part of the Load Path already (without me
>> changing anything)
>>
>> So I'm still puzzled (there are a few examples of code like this in
>> aforementioned tutorial book)!
>>
>>
> 
> Yeah I was wrong in thinking that load would load local vars. So like 
> others have said you will have to wrap your var in a method or class. 
> Or you could eval the file by reading the file in and running eval on  it.
> 
> #a.rb
> a = [1,2,3,4,5,6]
> __________________
> 
> #b.rb
> a_contents = File.open("a.rb"){|f| f.read}
> eval a_contents
> p a
> 
> # => [1, 2, 3, 4, 5]
> 
> -Ezra

[~/tmp] cat >a.rb
a = [1,2,3,4,5,6]
[~/tmp] cat >b.rb
a_contents = File.open("a.rb"){|f| f.read}
eval a_contents
p a
[~/tmp] ruby b.rb
b.rb:3: undefined local variable or method `a' for main:Object (NameError)
[~/tmp] ruby -v
ruby 1.8.2 (2004-12-25) [i686-linux]

This only works if you assign to 'a' somewhere in b.rb before the eval.

-- 
      vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407