Maybe this functionality is already somewhere in Ruby, but I could not
find it. This little snippet extends Array with a count method. It takes
a code block that can be used to count elements that match a specific
condition:

 a = Array[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
 puts a.count { |v| v < 5 }

  ==> 4

The code:

 class Array
   def count(&action)
     count = 0
     self.each { |v| count = count + 1 if action.call(v) }
     return count
   end
 end

Ruby is sweet :-)

 S.

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