From: Simon Krahnke <overlord@...>
Date: 2009-02-07T13:34:20+09:00
Subject: Re: Special Hash Constructors

* Robert Klemme <shortcutter@googlemail.com> (18:05) schrieb:

> ha = Hash.new {|h,k| h[k] = []}

> Since the idiom is so common, what does everybody think of putting it
> into the standard library:

Why not

def Hash.with(default=nil)
  new { | h, k | h[k] = default.dup }
end

> While we're at it, we might as well add
>
> def Hash.with_hashes
>   new {|h,k| h[k] = Hash.new(&h.default_proc)}
> end

I'm too tired for that. Does that create Hash with a default proc that
is the same as the one you specify right there?

mfg,                   simon .... l