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hasclass/Group an array into a Hash of Arrays

Created September 21, 2009 09:20
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Group an array into a Hash of Arrays
# Group an array into a Hash of Arrays
#
# [<Obj: name, category>,<Obj: name, category>,<Obj: name, category>]
#
# => {'category_1' => [<Obj: name, category>], 'category_2' => [<Obj: name, category>,<Obj: name, category>]}
arr.inject({}) {|hsh,obj| hsh[obj.category] ||= []; hsh[obj.category] << obj; hsh}
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