From: Siep Korteling <s.korteling@...>
Date: 2008-11-18T08:56:16+09:00
Subject: Re: function to select only certain key/value pairs from has

Chris Shea wrote:
> On Nov 17, 4:46�pm, Chris Shea <cms...@gmail.com> wrote:
>>
>> > Posted viahttp://www.ruby-forum.com/.
>>
>> Hmm... I thought there was a built in method for that. �Here's one
>> way:
>>
>> hash = {:a => 1, :b => 2, :c => 3}
>> Hash[*hash.select {|k,v| [:a,:b].include?(k)}.flatten] �#=>
>> {:b=>2, :a=>1}
>>
>> HTH,
>> Chris
> 
> Yeah, or the simpler: hash.reject {|k,v| ![:a,:b].include?(k)}

 And indeed, it's in facets:

require 'facets'
p hash.slice(:a,:b)

# However, this breaks on

hash.slice(:a,:d)

# and the hash.reject does not

hth,

Siep

Siep

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