On Mon, Jun 7, 2010 at 3:23 PM, Stéphane Ducasse
<[email protected]> wrote:
> yes this one looks good.
> but
>
> copyFrom: 1 to: does not convey that you should pass the second
> argument starting reverse.
Well, in ruby it's a general convention that negative indices start
counting from the right. A reasonable implementation would change all
sequenceable collections such that they accept negative indices.
In Phexample syntax:
((1 to: 5) at: -2) should = 4.
The alternative is to always have two accessors, then of course non-negative:
(1 to: 5) atFromEnd: 2) should = 4.
and:
('hello' from: 2 toFromEnd: 2) should = 'ell'
I clearly prefer the negative indices. Things you do all the time can
be much shorter than things you don't do so often. Huffman-encode your
programming :)
Cheers,
Niko
--
http://scg.unibe.ch/staff/Schwarz
twitter.com/nes1983
Tel: +41 076 235 8683
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