From: Mischa Fierer <f.mischa@...>
Date: 2009-01-02T18:46:14+09:00
Subject: Re: Help using ruby enumerator idioms


> But here inner_acc is always identical to acc, making the inject just
> for show.  You're back to using #each.
> 
> I guess the moral of the story is that functional style in ruby
> realistically applies only to flat arrays and hashes.  Once we reach
> the hash-of-hashes realm, imperative constructs are more suitable.
> 
> Lazy evaluation is needed to be efficient, recursive, and purely
> functional all at the same time.  (See Haskell.)

Interesting, thanks a ton for the reply.

I think you may be right that for hashes of hashes imperative style Ruby 
starts to make more sense.

This has been hitting me a lot lately, as one of the projects I'm 
working on has a lot of hashes of hashes (data crunching). I used the 
inject style a few times, but as you note, it becomes mostly just for 
show.

M


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