From: Joel VanderWerf <vjoel@...>
Date: 2007-09-13T04:20:24+09:00
Subject: Re: Merge an array of hashes

Luis Parravicini wrote:
> On 9/12/07, cleaner416 <cleaner416@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}

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407