From: Brian Candler <b.candler@...>
Date: 2010-06-18T00:07:11+09:00
Subject: Re: shorthand

Rick Denatale wrote:
> The difference between
> 
> x ||= 5
> 
> and
> 
> x = x | | 5
> 
> is that if x has a truthy value, then NO assignment will be done in
> the first case (including assignment through a 'setter' method) in the
> first case, but it will in the second.

I never said that foo.x ||= 5 behaves like this. This *is* a method call 
(:x=) not a local variable assignment.

class Foo
  def initialize(x=nil)
    self.x = x
  end
  def x
    @x
  end
  def x=(x)
    puts "set to #{x}"
    @x = x
  end
end
f = Foo.new
f.x ||= 3
f.x ||= 5
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