From: Robert Klemme <shortcutter@...>
Date: 2006-10-30T18:52:44+09:00
Subject: Re: Define a hash using %q?

On 30.10.2006 01:02, David Vallner wrote:
> Robert Klemme wrote:
>>> Well, if Ruby had clean blocks, the method using #inject might be more
>>> efficient - I don't know how expensive the implicit hash construction
>>> for method parameters is. Smalltalk muscle memory working there?
>> I am not sure what you are at here.  Object creation always costs - even
>>   small hashes.  Reason is memory allocation and GC management overhead.
>>
> 
> I meant that with clean blocks, to_enum(:each_slice, 2).to_a.inject({})
> { |h, (k, v)| h[k] = v) } might be the fastest variant because you could
> use a non-closure lambda (cheaper to construct, cacheable). A
> smalltalker nerve twitch might make you want to use inject to optimize
> this way - using idempotent lambdas where possible.

Ah, thanks for the explanation!  Only remark: the block for #inject 
would rather look like this, wouldn't it?

{|h, (k, v)| h[k] = v; h }

Kind regards

	robert