From: niklas | brueckenschlaeger <niklas@...>
Date: 2011-02-24T21:23:52+09:00
Subject: Re: a, b = Array.new(2).map!{|x| data.dup}

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On Thu, 2011-02-24 at 18:09 +0900, Brian Candler wrote:
> Stefan Salewski wrote in post #983443:
> > The code is related to handling configuration files, I have a basic
> > configuration set, a hash called @output. And variants for on screen,
> > pdf, png export.
>=20
> In that case, I'd say you'd be better off avoiding all the separate=20
> instance variables for each variant, and make it data-driven. Then you=
=20
> can interate over the variants, which will naturally avoid the repeated=
=20
> code.
>=20
> FORMATS =3D [:scr, :png, :pdf, :svg, :ps]
> ...
> @configs =3D {}
> FORMATS.each { |k| @configs[k] =3D @output.dup }

This would be the same as:

  @configs =3D Hash.new {|h,k| h[k] =3D @output.dup }

after that you can use pretty much any key you want :)

 -- niklas

>=20
> Now you have @configs[:scr], @configs[:png] etc, all pointing to=20
> separate copies of @output. And if you want to add another format in=20
> future, it's a trivial change.
>=20
> (Aside: please do not post variants of this code using 'inject', because=
=20
> it's stupid here. You know who you are. Thank you.)
>=20
> Regards,
>=20
> Brian.
>=20


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