[Leaplist] ruby stuff..

[Chris]

Fred Moore wrote:

>Ok all of you ruby guys and gals..  It seems I don't understand something 
>about variables and scope.. inside ruby..   Just started playing with it.. 
>
>I have found several references that say that you don't need to define a 
>variable.  they get defined the first time they are used..   Perhaps 
>something happens differently to variable scope inside a block..  anyway I am 
>confused.. perhaps someone can help me  out..  and educate this poor fool.. 3 
>books don't seem to explain the problem..   google tells me to quit bothering 
>it.  
>
>the following code snipit runs just fine..   and outputs each line with a line 
>number before it.. 
>
>-----------------------------------------------------
>#!/usr/bin/ruby -w
>file = File.new("buildFile.tex", "r")  
>counter=0
>while (l = file.gets)
>	puts "#{counter}:#{l}"
>	counter +=1	
>end
>file.close
>-----------------------------------------------------
>
>this next snipit blows up with a 
>
>"undefined local variable or method `all'  for main:Object (Name Error)"
>
>all that is added is line 5 all[counte]=l, I want to spin an array of lines 
>from the file.. 
>
>----------------------------------------------------
>#!/usr/bin/ruby -w
>file = File.new("buildFile.tex", "r")  
>counter=0
>  
>
all=[]

>while (l = file.gets)
>	all[counter]=l
>	puts "#{counter}:#{l}"
>	counter +=1	
>end
>file.close
>
>---------------------------------------------------
>
> so who can explain this behavior.. Fred
>
>  
>