From: "David A. Black" <dblack@...>
Date: 2008-10-02T20:13:06+09:00
Subject: Re: printf statement - "args" as an Array (or something...)

--1926193751-151137971-1222946061=:22741
Content-Type: MULTIPART/MIXED; BOUNDARY="1926193751-151137971-1222946061=:22741"

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

--1926193751-151137971-1222946061=:22741
Content-Type: TEXT/PLAIN; charset=X-UNKNOWN; format=flowed
Content-Transfer-Encoding: QUOTED-PRINTABLE

Hi --

On Thu, 2 Oct 2008, F. Senault wrote:

> Le 02 octobre =E0 11:58, John Pritchard-williams a =E9crit :
>
>> Trouble is I need a variable list as the args: I can't seem to pass in :
>> ["one","two"] - is there an idiom for this ?
>
> Splat it.
>
>>> txt =3D "%s -> %s\n"
> =3D> "%s -> %s\n"
>>> args =3D [ "first", "second" ]
> =3D> ["first", "second"]
>>> printf(txt, *args)
> first -> second
> =3D> nil
>
>>> txt =3D "%s -> %s -> %s\n"
> =3D> "%s -> %s -> %s\n"
>>> printf(txt, *[ args, "third" ].flatten)
> first -> second -> third
> =3D> nil

And in 1.9 you can do:

   [*args, "third"]


David

--=20
Rails training from David A. Black and Ruby Power and Light:
   Intro to Ruby on Rails  January 12-15   Fort Lauderdale, FL
   Advancing with Rails    January 19-22   Fort Lauderdale, FL *
   * Co-taught with Patrick Ewing!
See http://www.rubypal.com for details and updates!
--1926193751-151137971-1222946061=:22741--
--1926193751-151137971-1222946061=:22741--