From: Jean-Julien Fleck <jeanjulien.fleck@...>
Date: 2010-07-21T00:41:35+09:00
Subject: Re: Count occurences of vars in array

2010/7/20 Harry Kakueki <list.push@gmail.com>:
> p Hash[*(arr.uniq.map{|x| [x,arr.select{|y| y == x}.length]}).flatten]

Harry showed the way:

>> Hash[arr.group_by {|o| o}.collect{|k,v| [k,v.size]}]
=> {"a"=>2, "b"=>3, "c"=>2}

Cheers,

-- 
JJ Fleck
PCSI1 Lycée Kléber