From: Farrel Lifson <farrel.lifson@...>
Date: 2006-09-15T18:05:21+09:00
Subject: Re: arbitrary indexes

On 15/09/06, MonkeeSage <MonkeeSage@gmail.com> wrote:
> Jason Nordwick wrote:
> > Of course I don't believe that going from value_at to [] would make
> > my code faster, just that it would make it more compact. We started
> > using Ruby for some moderately heavy numerics, and I haven't been
> > able to be as concise (or productive) as I wish (or thought from what
> > others told me).
>
> So define your own implementation! That's one of the things that makes
> working in ruby so productive.
>
> class Array
>   def [](*args)
>     if args.size == 1
>       at(*args)
>     else
>       values_at(*args)
>     end
>   end
> end
>
> a = [1,2,3,4,5,6,7,8,9]
> p a[2] # => 3
> p a[2,4,6] #=> [3, 5, 7]
>
> Regards,
> Jordan
>
>
>

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]

Farrel