From: Phrogz <phrogz@...>
Date: 2007-09-13T06:10:09+09:00
Subject: Re: Merge an array of hashes

On Sep 12, 1:20 pm, Joel VanderWerf <vj...@path.berkeley.edu> wrote:
> Luis Parravicini wrote:
> > On 9/12/07, cleaner416 <cleaner...@gmail.com> wrote:
> >> For some reason I can't get my head wrapped around this trivial
> >> exercise.  I have an array of hashes like so
>
> >> a = [ { :some_key => :some_value }, { :another_key
> >> => :another_value } ]
>
> >> And I would like to flatten it to single hash in one line so I get
>
> >> { :some_key => :some_value, :another_key => :another_value }
>
> >> Any suggestions?
>
> > hash = Hash.new
> > a.each { |h| hash.merge! h }
>
> Or the equivalent using #inject, if you like:
>
> a = [ { :some_key => :some_value }, { :another_key => :another_value } ]
>
> merged = a.inject({}) {|acc, h| acc.merge! h}
>
> p merged  # ==> {:some_key=>:some_value, :another_key=>:another_value}

...which brings us back (almost) to JEGII's original response :)

On Sep 12, 12:59 pm, James Edward Gray II <ja...@grayproductions.net>
wrote:
> Sure:
>
>  >> a = [{:some_key => :some_value}, {:another_key => :another_value}]
> => [{:some_key=>:some_value}, {:another_key=>:another_value}]
>  >> a.inject { |all, h| all.merge(h) }
> => {:some_key=>:some_value, :another_key=>:another_value}