From: Bulat Ziganshin <bulatz@...>
Date: 2002-09-25T15:59:02+09:00
Subject: Re: are functions/methods "first class objects"?

Hello GOTO,

Wednesday, September 25, 2002, 9:30:40 AM, you wrote:

GK> Ruby 1.7 has Array#sort_by. The above are written as:

i know

GK>   def criteria(switch)
GK>     case switch
GK>     when "es"
GK>       Proc.new{|i| [File.extname(i), File.size(i)]}
GK>     when "n"
GK>       Proc.new{|i| File.basename(i).sub(/\.([^.]+)$/, "")}
GK>     else
GK>       Proc.new{|i| i}
GK>     end
GK>   end

GK>   puts Dir["*"].sort_by(&criteria("es"))

hmm. you don't understand. sort string is a sequence of chars, which
maps to sort criterions. this char may be

e for extennsion
n for filename w/o path/extension
s for size
g for group (one group is c sources, next - executables and so on)
i for some intellectual THING :)

i need to translate sequence of this chars to function which returns
array with all the data for sort_by:

sort_files "es"
sort_files "en"
sort_files "geis"

and much more variants. so i need to construct closure on the fly

-- 
Best regards,
 Bulat                            mailto:bulatz@integ.ru