From: Ryan Davis <ryand-ruby@...>
Date: 2011-12-07T20:46:27+09:00
Subject: Re: Ruby way to define binary


On Dec 6, 2011, at 12:05 , Misha Ognev wrote:

> hi2all
> 
> I have some trouble. How can i define the binary of value in ruby? (I
> have a value, and I want to know that's it true or false).

You don't really need to. Everything in ruby has a "truthiness" to it and can be used in logical expressions. Only nil and false are "falsey" and everything else are "truthy". In other words, just use objects and they'll take care of you.

if var then
  do_something
end

If you feel REALLY insecure about typing in a dynamic language you can always double-negate:

class Object
  def truthy?
    !!self
  end
end

if var.truthy? then # wasted cycles for no gain
  do_something
end