From: MonkeeSage <MonkeeSage@...>
Date: 2006-09-15T18:40:51+09:00
Subject: Re: arbitrary indexes

Farrel Lifson wrote:
> Be careful though as you've broken some functionality as Array#[] can
> take two arguments to return the y elements starting at index x.
>  [1,2,3,4,5,6,7][2,3] = [3,4,5]
> Your modification would make
>  [1,2,3,4,5,6,7][2,3] = [3,4]

Yup, caveat emptor. Jason indicated that he was aware of the default
functionality though, so I assume he would be mindful of that gotcha.

Also, I see that my code above wouldn't work for one of his desired
uses:

a=[0,11,22,33,44,55]
b=[1,3]
a[b] # => [11, 33]

For that to be supported as well, the implementation would have to be
something like:

class Array
  def [](*args)
    if args.size == 1
      if args.at(0).instance_of?(Array)
        values_at(*args.at(0))
      else
        at(*args)
      end
    else
      values_at(*args)
    end
  end
end

Regards,
Jordan