From: Michel Demazure <michel@...>
Date: 2010-12-31T19:50:37+09:00
Subject: Re: a common idiom

Michael Fellinger wrote in post #971622:
> compact
Yes ! I knew there was a method, but forgot the name, browsed thru 
Flanagan-Matz, and did not find it.

> results = []
> some.each do |value|
>   results << value.operation if value.condition?
> end

Yes, returning results, but I try to avoid this extra variable. I 
dislike (question of taste) the pattern
def ...
  res = []
...
  res <<
...
  res
end

Another way is using tap

Array.new.tap do |res|
...
end

A bit snob, no ?

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