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zuchmanski/gist:2555974

Created April 30, 2012 06:26
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gistfile1.rb
Hash[['foo', 'bar', 'foo', 'baz'].group_by {|s| s}.map {|k, v| [k, v.size]}]
#=> {"foo"=>2, "bar"=>1, "baz"=>1}
['foo', 'bar', 'foo', 'baz'].each_with_object({}) { |v, o| o[v] ||= 0; o[v] += 1 }
#=> {"foo"=>2, "bar"=>1, "baz"=>1}
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