From: Robert Klemme <shortcutter@...>
Date: 2008-11-30T16:54:51+09:00
Subject: Re: Enumerable#select used to return actual values

On 30.11.2008 04:46, Mike Austin 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 am pretty sure it did never.  Maybe you have a combination with 
to_enum in mind or rather inject?

>  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.

Maybe 1.9 has a nifty trick, I don't use it that often yet.

As said, inject is always a good candidate for this:

irb(main):005:0> (1..10).inject([]) {|r,a| r << (a*a) if a > 5; r}
=> [36, 49, 64, 81, 100]

Kind regards

	robert