From: Trans <transfire@...>
Date: 2008-12-01T01:47:11+09:00
Subject: Re: Enumerable#select used to return actual values



On Nov 30, 6:45 am, Trans <transf...@gmail.com> wrote:
> On Nov 29, 10:39 pm, Mike Austin <"mike[nospam]"@mike-austin.com>
> wrote:
>
> > I'm pretty sure select used to use the actual value of the called block,
> > instead of treating it as just a truthy/falsey boolean.  I know this is
> > unconventional, but it's a really nice, compact way of expressing map and
> > filter in one shot, like list comprehension:
>
> > (1..10).select { |a| a * a if a > 5 }
>
> > Was it ever there, or did I just have a dream about it?  It's easy to
> > implement... just wondering.
>
> I always thought it would be nice if Ruby had a method for this.
> Facets' provides #compact_map. Perhaps not the sexiest name (once upon
> a time it was called #collect_if), but it's describes the behavior
> properly.

Oh, I remember why it is called #compact_map now, rather then some
more concise name. And I've been meaning to bring it up again. Why not
let #compact itself take a block to do this?

T.