From: Rick DeNatale <rick.denatale@...>
Date: 2010-06-18T03:09:27+09:00
Subject: Re: shorthand

On Thu, Jun 17, 2010 at 11:07 AM, Brian Candler <b.candler@pobox.com> wrote:
> I never said that foo.x ||= 5 behaves like this. This *is* a method call
> (:x=) not a local variable assignment.

No, but you said that "foo ||= 5 is shorthand for foo = foo || 5"
which implies the same semantics, but...

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

f.x = f.x || 6

produces:

set to
set to 3
set to 3


See the difference?

-- 
Rick DeNatale

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