From: Yukihiro Matsumoto <matz@...>
Date: 2005-04-02T11:11:19+09:00
Subject: Re: Two Questions about Hash Defaults

Hi,

In message "Re: Two Questions about Hash Defaults"
    on Sat, 2 Apr 2005 10:28:12 +0900, Pete Elmore <pete@petta-tech.com> writes:
|
|I have a couple of questions about hashes.  The first is fairly simple: 
|is there a way to set a default so that when the value for a key is 
|changed, the object it points to is default.dup instead of default?

list = Hash.new{[]}

|The second question is about setting defaults from one hash based on 
|another.  This question is more along the lines of 'Does this code 
|violate Ruby sensibilities?'

defaults = {
	:preserve_breaks => true,
	:indent => 0,
	:columns => 79,
}
list = Hash.new{|h,k|defaults[k]}