From: Luigi Ballabio <ballabio@...>
Date: 2001-10-11T16:34:41+09:00
Subject: [ruby-talk:22423] Re: list comprehensions alike Python ???

At 09:08 AM 10/11/01 +0900, you wrote:
>On Thu, 11 Oct 2001, Paul Prescod wrote:
>
> > Out of curiousity, what would the Ruby for this look like:
> >
> > >>> arr = [x*x for x in range(0,10) if x%2==0]
> > >>> arr
> > [0, 4, 16, 36, 64]
> >
> > A combination of filter and map?
>
>sure:
>arr = (0..10).collect{|x| x*x}.select{|x| x.even?}

How about
 >>> l = [(x,y) for x in range(1,5) for y in range(1,5) if x+y < 5]
 >>> l
[(1, 1), (1, 2), (1, 3), (2, 1), (2, 2), (3, 1)]

Bye,
         Luigi