From: Kero <kero@...>
Date: 2006-02-19T07:48:29+09:00
Subject: Re: [QUIZ] metakoans.rb (#67)

>> I also have 13; however, two lines exceed 80 columns. Additionally, I
>> have no support for multiple attributes on one line -- seems logical
>> to have...
>
> 13 seems to be the lower limit without seriously golfing.  My "best"
> solution at this point runs about 18 lines, but it'd be 13 if I took out
> all the blank lines and one line that makes it faster but doesn't affect
> the semantics.

Dunno about golfing, been snowboarding the whole week.

I'm near koan 8 with 28 lines, and I need sleep (failed at 7, while
wondering why the program knew I did [need sleep]; Then I solved 7 while
puzzling about 8, or actually ironing out an inconsistency in my program;
maybe I am already asleep)

Anyway, what I wanted to post about: in the description/code there are a few
asserts like this:
   assert{ (o.a = nil) == nil }
which will always be asserted, since Ruby evaluates 'a = b' to b, no matter
what a is; specifically, it does not evaluate to the result of #a= in code
like 'o.a = b'; imho, this makes perfect sense for statements like 'a = b = c'

Code to show:

class X
  attr_reader :ha
  def ha=(val)
    @ha = "not what you expect"
  end
end
x = X.new
p x.ha = nil           # => nil
p x.ha                 # => "not what you expect"
p (x.ha = nil) == nil  # => true

Bye,
Kero.

PS: fun quiz!