From: Trans <transfire@...>
Date: 2008-11-30T20:45:42+09:00
Subject: Re: Enumerable#select used to return actual values



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.

T.