From: Joey <rubytalk@...>
Date: 2006-09-28T07:13:44+09:00
Subject: Re: Injecting truth

------=_Part_29488_10153643.1159395221152
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

Hmm, why Enumerable#all? without short circuit? If you get to a point where
the block doesnt apply, then you might aswell break.

j`ey
http://www.eachmapinject.com

On 9/27/06, Ken Kunz <kennethkunz@gmail.com> wrote:
>
> I had a scenario arise today where I needed an iterator with similar
> semantics as Enumerable#all?, but non-short-circuiting. We came up with
> a fairly elegant solution (imho), so I thought I'd be a good rubyzen
> and share :)
>
> 1) First... the standard #all? (short-circuits):
>
> irb> (1..5).all? { |i| puts i; i < 3 }
> 1
> 2
> 3
> => false
>
> 2) Non-short-circuiting version (injecting truth):
>
> irb> (1..5).inject(true) { |retval, i| puts i; retval &&= (i < 3) }
> 1
> 2
> 3
> 4
> 5
> => false
>
> 3) One more way (though I like #2 better)
>
> irb(main):016:0> (1..5).partition { |i| puts i; i < 3 }.last.empty?
> 1
> 2
> 3
> 4
> 5
> => false
>
> -Ken
>
>
>

------=_Part_29488_10153643.1159395221152--