From: Chris Dutton <rubyguru@...>
Date: 2004-04-21T14:14:07+09:00
Subject: Re: efficient collect+compact ?

Martin Pirker wrote:
> Hello...
> 
> What's the most efficient way for
> 
> puts [1,2,3,4,5,6,7,8,9,10].collect{ |x| next if x % 2 == 0; x+10 }.compact
> or
> puts [1,2,3,4,5,6,7,8,9,10].collect!{ |x| next if x % 2 == 0; x+10 }.compact!

Hmmm... not sure I can offer any help in increasing performance, but it 
seems perhaps the following is a bit cleaner:

puts (1..10).to_a.collect{ |x| x + 10 if x % 2 == 0 }.compact