From: "David A. Black" <dblack@...>
Date: 2008-03-25T23:40:05+09:00
Subject: Re: hash of arrays - appending to one of the arrays

--1926193751-477283966-1206456009=:29004
Content-Type: MULTIPART/MIXED; BOUNDARY="1926193751-477283966-1206456009=:29004"

  This message is in MIME format.  The first part should be readable text,
  while the remaining parts are likely unreadable without MIME-aware tools.

--1926193751-477283966-1206456009=:29004
Content-Type: TEXT/PLAIN; charset=X-UNKNOWN; format=flowed
Content-Transfer-Encoding: QUOTED-PRINTABLE

Hi --

On Tue, 25 Mar 2008, Jes=FAs Gabriel y Gal=E1n wrote:

> On Tue, Mar 25, 2008 at 1:41 PM, Adam Akhtar <adamtemporary@gmail.com> wr=
ote:
>>
>> > The most common idiom is:
>> >
>> >    (hash[key] ||=3D []) << value
>> >
>>
>>  Thanks for the reply. Can I ask what these || mean..in this case do the=
y
>>  mean OR???
>
> a ||=3D b means a =3D a || b

Almost, but this:

   a or a =3D b

covers the edge cases better.


David

--=20
Rails training from David A. Black and Ruby Power and Light:
   ADVANCING WITH RAILS   April 14-17          New York City
   INTRO TO RAILS         June 9-12            Berlin
   ADVANCING WITH RAILS   June 16-19           Berlin
See http://www.rubypal.com for details and updates!
--1926193751-477283966-1206456009=:29004--
--1926193751-477283966-1206456009=:29004--