From: Farrel Lifson <farrel.lifson@...>
Date: 2007-03-09T05:58:48+09:00
Subject: Re: [ ruby-Patches-9055 ] Dynamic Array#join with block

On 06/03/07, Nobuyoshi Nakada <nobu@ruby-lang.org> wrote:
> It sounds like sep can't be omitted.  I guess it might be nice
> if ary.join(*seps) yields a, b, *seps.

I've modified the patch so that it is now called with the
separator being optional and following the two elements that
will be joined.

[1,3,2,4].join{|a,b| a > b ? ">" : "<"}
=>"1<3>2<4"

or

[1,3,2,4].join("-"){|a,b,sep| sep + (a > b ? ">" : "<")}
=>"1-<3>-2-<4"

Farrel