From: AD60 <andredeen@...>
Date: 2009-03-01T20:39:03+09:00
Subject: Re: Newbie question > Hash workings


I see the use with an integer default, I specifically meant the
Hash.new([]) syntax as problematic, but it probably all depends on
knowing what your doing.

Just to detail the difference:


hav = Hash.new { |h,k| h[k] = []}
hav[0] += [1]
p hav               # {0=>[1]}
p hav[1]            # []
p hav               # {0=>[1], 1=>[]}

hiv = Hash.new 0
hiv[0] += 1
p hiv               # {0=>1}
p hiv[1]            # 0
p hiv               # {0=>1}

it's the difference between "{0=>[1], 1=>[]}" and "{0=>1}" result that
had me wondering. Anyway thanks again, I understand how to use it and
that's more than enough for now.

Kind regards,
André