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stouset/gist:1608686

Created January 13, 2012 21:04
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gistfile1.rb
def purge_if
self.inject({}) do |hash, (key, value)|
yield(key, value) ? hash : hash.update(key => self.delete(key))
end
end
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stouset commented Jan 13, 2012 

>> h
=> {:b=>2, :a=>1}
>> h.purge_if {|k,v| k == :a }
=> {:b=>2}
>> h
=> {:a=>1}

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