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Enumerable#group_by

November 13, 2012

This is awesome!

>  ['and', 'alter', 'antler', 'bag', 'boy', 'big', 'cat', 'cloy', 'climb'].group_by{|a| a[0]}
 => {"a"=>["and", "alter", "antler"], "b"=>["bag", "boy", "big"], "c"=>["cat", "cloy", "climb"]} 
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