From: Tobias Reif <tobiasreif@...>
Date: 2001-09-02T02:20:06+09:00
Subject: [ruby-talk:20674] Re: corresponding "non-bang" method to []=

Hi Michael,

[...]


 []= is bang. What's the non-bang version?
>>
> 
> There's no one.



> Does it make sense to have one? Not for me.


It's very nice to have non-bang versions of most methods; it results in 
nicer code: workarounds using dup/clone are less concise and elegant IMHO.


>>I'm trying to modify specific members of an array, depending on their 
>>position in the array ("second and last get a newline" etc.).
[...]
>>Now after hours of trying, I only got it to work using a dirty hack.
>>I'm looking for a nice way.

[...]


>>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

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


Like I said: I got it to work (using a counter); but I'm looking for an 
elegant way.
The simple task I'm writing can be done in any language , but I chose 
Ruby to enjoy writing nice code.

Tobi

-- 
Tobias Reif
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