Ruby » Ruby master

Feature #11076

Updated by nobu (Nobuyoshi Nakada) over 9 years ago

I very often use `Hash[array.group_by{|x|x}.map{|x,y|[x,y.size]}]`. 

 Would be nice with to have a method called `count_by`: 

 ~~~ruby 
 

     array = ['aa', 'aA', 'bb', 'cc'] 
 
     p array.count_by(&:downcase) #=> {'aa'=>2,'bb'=>1,'cc'=>1} 
 ~~~

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