From: Devin Mullins <twifkak@...>
Date: 2007-02-15T14:22:55+09:00
Subject: Re: Drying a ternary condition

Marcello Barnaba wrote:
> How would you write the following statement:
> klass.send((ARGV[0] || :up).to_sym == :up ? :up : :down)
> ? 
klass.send(%w{up down}.find(:up) {|dir| dir == ARGV[0]})

The only way I can think of to get rid of the second 'up' is to 
introduce an abstraction. It provides an additional piece of information 
-- which one's the default. So:

dirs = %w{up down}
klass.send(dirs.find(dirs.first) {|dir| dir == ARGV[0] })

Devin