From: "Kroeger Simon (ext)" <simon.kroeger.ext@...>
Date: 2005-09-06T17:14:20+09:00
Subject: Re: [Q] how to do insertion and smooth traversal simultaneously on array


as Robert said:
-----------------------------------------------------------------
a = [ 0, 1, 2, 3, 4, 5 ]
actions = []
a.each_with_index do |x, i|
  puts "[#{i}] : #{x}"
  if i % 2 == 0  # even index ?
    actions << [a, :insert, [i, ':-)']]
  end
end
# do it!
actions.reverse.each{|action| action[0].send(action[1], *action[2])}
puts a.size 
------------------------------------------------------------------

[0] : 0
[1] : 1
[2] : 2
[3] : 3
[4] : 4
[5] : 5
9

cheers

Simon

> -----Original Message-----
> From: SHIGETOMI, Takuhiko [mailto:tshiget1@gw.nsw.co.jp] 
> Sent: Tuesday, September 06, 2005 9:32 AM
> To: ruby-talk ML
> Cc: tshiget1@gw.nsw.co.jp
> Subject: [Q] how to do insertion and smooth traversal 
> simultaneously on array
> 
> greetings, guys.
> 
> this is a pseudo-ruby code which shows what i am expecting.
> 
> a = [ 0, 1, 2, 3, 4, 5 ]
> a.each_with_index do |x, i|
>   puts "[#{i}] : #{x}"
>   if i % 2 == 0  # even index ?
>     a.insert( i, ':-)' )
>     skip 1 # <- this is a pseudo directive to skip the next element
>            #    which has just been inserted now
>   end
> end
> puts a.size
> 
> expected output...
> 
> [0] : 0
> [1] : 1
> [2] : 2
> [3] : 3
> [4] : 4
> [5] : 5
> 9         <-- means that 3 smileys have been inserted
> 
> as above, i want to traverse an array with some conditional 
> insertion to
> itself.
> 
> do anyone know cool way for that?
> 
> ttsp://void/3d/universe/milky-way-galaxy/orion-arm/sol-solar-system/
> 3rd-planet/fareast/jp/tky/shigetomi.takuhiko.5618
> 
> 
>