From: Tobias Reif <tobiasreif@...>
Date: 2001-09-02T02:22:12+09:00
Subject: [ruby-talk:20675] RCR: non-bang equivalent to []=

Hi,

RCR:

I'm rying to modify specific items in a nested array, without modifying 
the original.
I tried some variations, but most things that come to mind failed.
There are ways to achive what I want (I found some hack that works for me),
but I believe it would be good for the ease of use to introduce the 
following:

#

[]= is bang;
so
a version of []= that doesn't modify the receiver
would be cool.

1.1.
Array#set_at position, new_value
  an_array.set_at(2, new_value)

and maybe
1.2.
  Array#set_at!

or
1.3.
  an_array.at(2) = new_value


#

"add a newline to the second and last item in the array"

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 even:

an_array.each_index do |index,item|

or

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


Tobi
-- 
Tobias Reif
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