"gabriele renzi" <surrender_it / remove.yahoo.it> schrieb im Newsbeitrag
news:f9gha09qpp95hdmuhq498pjneu2qkqmeh1 / 4ax.com...
> il Mon, 17 May 2004 13:30:49 +0200, Kristof Bastiaensen
> <kristof / vleeuwen.org> ha scritto::
>
> >Hi,
> >I would like to know your opinion about the following idea's.
> >(It is actually are two RCR's)
> >
> >(1)* Enumerable::filter and Enumerable::enum_filter
> >
> >filter([[method = :each], *args, ] block)
> >  yield values for which block returns true
> >
> >3.filter(:times, &lambda{ |i| i[0] == 0 }) do |n|
> >  puts "%i is even" % n
> >end
> >=> 2 is even
>
> what's wrong with
> (1..3).select {|x| x[0]==0}.each {|x| p x}
> ?

If the Enumerable contains a huge number of elements then this version
will burn a lot of memory while in certain cases (e.g. printing) it is
more efficient to be able to handle one element at a time only.

Well, of course in those cases you could simply do

(1..3).each {|x| p x if x[0]==0}

:-)

Regards

    robert