From: Rick DeNatale <rick.denatale@...>
Date: 2009-08-29T22:58:43+09:00
Subject: Re: #map, #select semantics

On Sat, Aug 29, 2009 at 9:25 AM, Yukihiro Matsumoto<matz@ruby-lang.org> wrote:
> Hi,
>
> In message "Re: #map, #select semantics"
>    on Sat, 29 Aug 2009 21:32:21 +0900, 7rans <transfire@gmail.com> writes:
>
> |Let's say we have
> |
> |  [[:a,1], [:b,2]].map{ |(k,v)| [k, v+1] }  #=> [[:a,2], [:b,3]]
> |
> |We might have something like:
> |
> |  [[:a,1], [:b,2]].using({}).map{ |(k,v)| [k, v+1] }  #=> {:a=>2, :b=>3}
>
> [[:a,1], [:b,2]].inject({}){|h,(k,v)| h[k]=v+1; h}     #=> {:a=>2, :b=>3}

+1

Proving that inside every map there's an inject struggling to break free! <G>

Seriously, although my Smalltalk background gives me a philosophical
preference for having ruby enumeration work more like Smalltalk, from
a pragmatic perspective, I'd prefer it if changes wouldn't break my
existing code.


-- 
Rick DeNatale

Blog: http://talklikeaduck.denhaven2.com/
Twitter: http://twitter.com/RickDeNatale
WWR: http://www.workingwithrails.com/person/9021-rick-denatale
LinkedIn: http://www.linkedin.com/in/rickdenatale