From: Corey Haines <coreyhaines@...>
Date: 2007-08-19T23:38:42+09:00
Subject: Re: Adding to an array question

Thanks for the tips, Stefan. I like your tip on doing .dup, as well.

Thanks again!

-Corey

On 8/18/07, Stefan Rusterholz <apeiros@gmx.net> wrote:
> Corey Haines wrote:
> > I need to add a string to the end of an array count number of times. I
> > was wondering if I could get some advice on the prefered way to do it
> > in Ruby.
> >
> > @bucket is the array
> >
> >
> > def add_person(count, name)
> >  @bucket += Array.new(count, name)
> > end
> >
> > or some other ideas
> >
> > def add_person(count, name)
> > count.times {@bucket << name }
> > end
> > # or some variation of looping
> >
> > Personally, I like the adding a new array to the @bucket array. I
> > realize (at least I assume) that it creates a temporary Array, but I
> > think it is more understandable?
> >
> > Thoughts?
> > Thanks, I'm just learning Ruby
> > -Corey
>
> def add_person(name, count=1) # I assume adding once as a default is
> rather safe
>  @bucket.concat(Array.new(count) {name.dup }) # a) this will create a
> new string object everytime
>  @bucket.concat(Array.new(count, name) # b) this will use the *same*
> string object everytime
> end
>
> Use either a) or b). Be aware that with b) if you do e.g.
> @bucket.last.upcase!, it will reflect on all slots that contain the same
> object.
> As to why I prefer this concat solution over array +=: it doesn't create
> throw away objects everytime.
>
> Regards
> Stefan
> --
> Posted via http://www.ruby-forum.com/.
>
>


-- 
http://www.coreyhaines.com