From: Yukihiro Matsumoto <matz@...>
Date: 2005-07-19T21:12:05+09:00
Subject: Re: [RCR] nil for unassigned keys

Hi,

In message "Re: [RCR] nil for unassigned keys"
    on Tue, 19 Jul 2005 20:40:47 +0900, Simon Strandgaard <neoneye@gmail.com> writes:

|Sometimes I find myself writing  :key=>true,
|it would be nice if one didn't had to do assignment,
|so its value instead defaulted to nil.
|
|def test(hash={})
|	p hash
|end
|
|test('x', 'y'=>2, 'z')         #  {"x"=>nil, "y"=>2, "z"=>nil}

In that case, how can we distinguish a hash key without value and
ordinal mandatory argument?

							matz.