From: Chad Perrin <code@...>
Date: 2011-04-02T04:43:34+09:00
Subject: Re: Simple array.each do |x| question

--5mCyUwZo2JvN/JJP
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Content-Transfer-Encoding: quoted-printable

On Sat, Apr 02, 2011 at 04:29:13AM +0900, Kyle X. wrote:
> Thank you all for your responses.  I have a second part question.  I=20
> still cannot get the array.each do || correct, so I have been having to=
=20
> use these long and unsophisticated while loops:
>=20
> -------------------------------------
> n =3D 0
> elements =3D []
> while n !=3D reference1.length
>   x =3D=20
> REXML::XPath.match(doc,"//*[@id=3D'#{reference2[n]}']/Coordinates/IfcLeng=
thMeasure").map=20
> {|element| element.text}
>   elements << x
>   n=3Dn+1
> end

I seem to have misplaced the thread so far, so please forgive me if I'm
asking something redundant.

What is the relationship between reference1 and reference2?

If they are the same, you should be able to do a very simple swap of
terms between your while loop version and an each iterator:

    elements =3D []
    reference2.each do |ref|
      x =3D REXML::XPath.match(
        doc,
        "//*[@id=3D'#{ref}']/Coordinates/IfcLengthMeasure"
      ).map {|element| element.text }

      elements << x
    end

(adjusted to reduce horizontal sprawl)

If reference1 and reference2 are not the same length, however, this
approach will not work.  The lack of descriptive meaning in your variable
names is a bit daunting when trying to figure out the intentions behind
your code.

I'll come back to the second while loop later, if someone else has not
already gotten to it by then.

--=20
Chad Perrin [ original content licensed OWL: http://owl.apotheon.org ]

--5mCyUwZo2JvN/JJP
Content-Type: application/pgp-signature
Content-Disposition: inline

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2.0.14 (FreeBSD)

iEYEARECAAYFAk2WJ/4ACgkQ9mn/Pj01uKUTPACguDM4o7oJPwfTjmwpMubL5npF
2gIAn27oYCq3mfV9TOI/HGkr2zrFTngs
=CyVW
-----END PGP SIGNATURE-----

--5mCyUwZo2JvN/JJP--