From: Thiago Nunes <brasilokau@...>
Date: 2009-06-13T20:16:26+09:00
Subject: Re: Noob question, regarding array

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yes that was the problem.I just typed initialize incorrectly=2C so my array=
 was not being initialized.I should've got a decent ide to avoid this stupi=
d mistakes.
Thanks

> Date: Sat=2C 13 Jun 2009 18:54:10 +0900
> From: stefano.crocco@alice.it
> Subject: Re: Noob question=2C regarding array
> To: ruby-talk@ruby-lang.org
>=20
> On Saturday 13 June 2009=2C Thiago wrote:
> > |I'm a noob=2C trying to learn ruby.
> > |I'm following along with the book  Programming Ruby=2C The Pragmatic
> > |Programmer's Guide=2C which comes with ruby documentation.
> > |
> > |Im on chapter=2C Implementing a SongList Container=2C doing the code
> > |samples=2C but i'm getting the following error when trying to run the
> > |code:
> > |18:in `append': undefined method `push' for nil:NilClass
> > |(NoMethodError)
> > |	from F:/InstantRails/rails_apps/test/test2.rb:80
> > |
> > |I have a SongList class with the following method:
> > |
> > |	def append(aSong)
> > |		@songs.push(aSong)
> > |		self
> > |	end
> > |
> > |and im trying to run the code sample as in the book:
> > |
> > |list =3D SongList.new
> > |list.
> > |  append(Song.new('title1'=2C 'artist1'=2C 1)).
> > |  append(Song.new('title2'=2C 'artist2'=2C 2)).
> > |  append(Song.new('title3'=2C 'artist3'=2C 3)).
> > |  append(Song.new('title4'=2C 'artist4'=2C 4))
> > |
> > |This doesnt make any sense. I can create the Song object just fine=2C
> > |but if i try to add it to the array i get this erro.
> > |Can anyone help me please?
>=20
> What do you have in the initialize method of the SongList class? From the=
=20
> error message you get=2C it seems that @songs is nil instead of being an =
array.=20
> To avoid this=2C you need to set the @songs instance variable to an array=
 and=20
> usually this is done in the initialize method. It should be something lik=
e=20
> this:
>=20
> class SongList
>=20
>   def initialize
>     #other initialization code can go here=20
>     @songs =3D []
>     #other initialization code can go here=20
>   end
>=20
> end
>=20
> I hope this helps
>=20
> Stefano
>=20

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