From: Tobias Reif <tobiasreif@...>
Date: 2001-09-02T00:24:02+09:00
Subject: [ruby-talk:20671] corresponding "non-bang" method to []=

Hi,

There's "collect", and the bang version "collect!"

AFAICS, []= is bang. What's the non-bang version?

I'm trying to modify specific members of an array, depending on their 
position in the array ("second and last get a newline" etc.).

I'm working my way through the docs, faqs, and the Pickaxe.
Now after hours of trying, I only got it to work using a dirty hack.
I'm looking for a nice way.

So because in collect there is no index passed to the block, I need to 
use each_index, where I need to use []= to set the new value. (AFAIK)

But I don't want to modify the original, because I need to modify it 
differently in another method starting from it's previous state.

In pseudo-code:

an_array.each_index do |x|
  new_val = an_array.at(x) + "\n"
  if (x == 2) or (x == (an_array.size - 1))
   an_array.set_at(x,new_val)
  end
end

or

an_array.collect |index,item|
   if (index == 2) or (index == (an_array.size - 1))
     item + "\n"
   else
     item
   end
end


Tobi

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Tobias Reif
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