From: Mike Austin <"mike[nospam]"@...>
Date: 2008-12-07T07:58:48+09:00
Subject: Re: Enumerable#select used to return actual values

Mark Thomas wrote:
> On Dec 4, 11:07 am, Yukihiro Matsumoto <m...@ruby-lang.org> wrote:
>> Hi,
>>
>> In message "Re: Enumerable#select used to return actual values"
>>     on Fri, 5 Dec 2008 00:47:45 +0900, Trans <transf...@gmail.com> writes:
>>
>> |> (1..10).collect{ |a| a * a if a > 5 }.compact
>> |>
>> |> The only time this doesn't work is when you want to preserve nils in
>> |> your original array.
>> |
>> |And that's exactly what I suggested for #compact, to take a block but
>> |faster b/c it's one pass.
>>
>> I don't deny the existence of use case of such method (although I
>> cannot think of any realistic one right now), but its name should not
>> be #compact, since it does far more than compacting the receiver.
>>
>>                                                         matz.
> 
> #comprehend ?

I know someone brought it up already, but why not "collect_if"?  It's 
"collect", with an "if" :)

evens_squared = (1..10).collect_if { |n| n * n if n % 2 == 0 }

Mike