From: Phrogz <phrogz@...>
Date: 2007-07-21T04:44:59+09:00
Subject: Re: Array : each_with_index

On Jul 19, 3:06 am, Pe�a, Botp <b...@delmonte-phil.com> wrote:
>  1  puts "---scheme 1---"
>  2  r = ['KLP','OGN']
>  3  msg =<<MSG
>  4    #{puts "Found #{r.length} orders"}
>  5    #{r.map.each_with_index{|v,i|  puts "(#{i+1})  #{v}\n" }}
>  6  MSG
>  7  msg
>  8
>  9  puts "---scheme 2---"
> 10  r = ['KLP','OGN']
> 11  <<MSG
> 12    #{puts "Found #{r.length} orders"}
> 13    #{r.map.each_with_index{|v,i|  puts "(#{i+1})  #{v}\n" }}
> 14  MSG
> 15
> 16  puts "---scheme 3---"
> 17  r = ['KLP','OGN']
> 18  puts "Found #{r.length} orders"
> 19  r.each_with_index{|v,i|  puts "(#{i+1})  #{v}\n" }

One other variation which looks a little closer to what the OP wanted:

  module Enumerable
    def map_with_index
      idx = -1
      map{ |v| yield v,idx+=1 }
    end
  end

  puts "---scheme 4---"
  r = ['KLP','OGN']
  msg =<<ENDMSG
    Found #{r.length} orders
    #{r.map_with_index{ |v,i| "(#{i+1}) #{v}"}.join("\n")}
  ENDMSG
  puts msg