From: Brian Candler <b.candler@...>
Date: 2010-07-07T22:16:58+09:00
Subject: Re: Ruby switches

user = Object.new
def user.banned?; false; end
def user.activated?; true; end

# Example 3

class Pred
  def initialize(sym)
    @sym = sym
  end
  def ===(other)
    other.send(@sym)
  end
end
def is(sym); Pred.new(sym); end
Banned = is(:banned?)
Activated = is(:activated?)

case user
when Banned;    puts "Banned!"
when Activated; puts "Activated!"
end
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