ruby on rails - Using an array of hashes I need to compare two values -

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i have following array of hashes:

 [{"dwidnote"=>14, "streetaddress"=>"250 palm valley blvd.", "propertyaddress"=>"250 palm valley blvd."},  {"dwidnote"=>16, "streetaddress"=>"2801 alaskan way", "propertyaddress"=>"2801 alaskan way"},  {"dwidnote"=>17, "streetaddress"=>"300 lakeside drive", "propertyaddress"=>"300 lakeside drive  "},  {"dwidnote"=>18, "streetaddress"=>"3817 parkdale", "propertyaddress"=>"3817 parkdale  "}]

i need compare values keys streetaddress , propertyaddress see if match. values not match need display value key dwidnote. how do this?

assuming array in variable named a this:

a.select{|e| e['streetaddress'] != e['propertyaddress']}.map{|e| e['dwidnote']}

will return this:

[17, 18]

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