From: sur max <sur.max@...>
Date: 2007-02-16T01:40:58+09:00
Subject: Re: is it behaving strange ?

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Thats pretty known.
And even this too...

a =3D 2,3,4,5,6  # =3D> [2,3,4,5,6]

b, =3D a   --- now this is beauty
b # =3D> 2
b,c =3D a
b # =3D> 2
c # =3D> 3
and so...
b,c,d =3D a

but still  didnt get clear .... is it like we can use *a for assigning to
some other var ONLY ?

On 2/15/07, hemant <gethemant@gmail.com> wrote:
>
> On 2/15/07, sur max <sur.max@gmail.com> wrote:
> > ok and its like ....
> >
> > *a =3D 9
>
> remember a would become an array here.because as explained above,if
> lvalue is prefixed with asterisk, then rvalue is collected and
> assigned to lvalue as an array.
>
> > a << 5
>
> append 5 to a (which is an array)
>
> > b =3D *a # =3D> [9,5]
> > is there any relation in this n above ?
>
> Now, above is pretty standard ruby behaviour, it has nothing to do
> with * operator, as usual * extracts the values from a(which was an
> array).
>
> For example:
>
> irb(main):062:0> b =3D 9,5
> [9, 5]
> irb(main):063:0> b
> [9, 5]
> irb(main):064:0> b,c =3D 9,5
> [9, 5]
> irb(main):065:0> b
> 9
> irb(main):066:0> c
> 5
>
>
>
>
> >
> > On 2/15/07, dblack@wobblini.net <dblack@wobblini.net> wrote:
> > >
> > > Hi --
> > >
> > > On Fri, 16 Feb 2007, hemant wrote:
> > >
> > > > On 2/15/07, sur max <sur.max@gmail.com> wrote:
> > > >> *a =3D 9     # =3D> [9]
> > > >> a     # =3D> [9]
> > > >> *a    # =3D> compile error
> > > >> *b=3D*a    # =3D> [9]
> > > >> *b =3D a    # =3D> [[9]]
> > > >> b =3D a    # =3D> [9]
> > > >> b =3D *a    # =3D> 9 ----- this is amazing ?
> > > >
> > > > Splat operator is amazing, but above behaviour can be explained
> using
> > > this:
> > > >
> > > > "If the last lvalue is preceded by an asterisk, all the remaining
> > > > rvalues will be collected and
> > > > assigned to that lvalue as an array. Similarly, if the last rvalue
> is
> > > > an array, you can
> > > > prefix it with an asterisk, which effectively expands it into its
> > > > constituent values in
> > > > place. (This is not necessary if the rvalue is the only thing on th=
e
> > > > right side=97the array
> > > > will be expanded automatically.)
> > > > "
> > > > See, nothing wierd out there. ;)
> > >
> > > Another way to look at it, which I think covers all of the above
> > > cases, is:
> > >
> > >    *x equals [x] without the []
> > >
> > > So:
> > >
> > >    *a =3D 9   # a without the [] is 9, so a =3D=3D [9]
> > >    *b =3D a   # b without the [] is [9], so b =3D=3D [[9]]
> > >    b =3D *a   # b =3D=3D [9] without the [], so b =3D=3D 9
> > >
> > >
> > > That's why I call it the "unary unarray" operator.
> > >
> > >
> > > David
> > >
> > > --
> > > Q. What is THE Ruby book for Rails developers?
> > > A. RUBY FOR RAILS by David A. Black (http://www.manning.com/black)
> > >     (See what readers are saying!  http://www.rubypal.com/r4rrevs.pdf=
)
> > > Q. Where can I get Ruby/Rails on-site training, consulting, coaching?
> > > A. Ruby Power and Light, LLC (http://www.rubypal.com)
> > >
> >
> >
> >
> > --
> > sur
> > http://expressica.com
> >
>
>
> --
> gnufied
> -----------
> There was only one Road; that it was like a great river: its springs
> were at every doorstep, and every path was its tributary.
> http://people.inxsasia.com/~hemant
>
>


--=20
sur
http://expressica.com

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