From: Jim Menard <jimm@...>
Date: 2002-09-26T23:54:53+09:00
Subject: Re: call for commentary: review of Ruby for a magazine (long, sorry!)

"Rich Kilmer" <rich@infoether.com> writes:

> Interesting...I usually do:
> 
> puts "warning" unless obj 
> 
> Since obj is true if not nil
> 
> The "if obj.nil?" may appear clearer, but 'unless obj' is easy to 
> grok as well.  And of course this works only for cases where obj
> is not a boolean value...

It's ever so slightly faster, too.

prompt> time ruby -e 'nope = nil; 1_000_000.times { x = 42 unless nope }'

real    0m0.924s
user    0m0.920s
sys     0m0.000s

prompt> time ruby -e 'nope = nil; 1_000_000.times { x = 42 unless nope.nil? }'

real    0m0.994s
user    0m0.980s
sys     0m0.010s

Jim
-- 
Jim Menard, jimm@io.com, http://www.io.com/~jimm/
# A Ruby script that prints all the digits of pi (sorted).
(0 .. 9).each { | i | print i while true }