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Array Count tips

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  1. array = [1,1,2,2,3,4,5]
  2. array.count # => 7
  3. array.count(1) # подсчитает количество элементов "1" => 2
  4. array.count{ |p| p > 2 } # подсчитает элементы по условию => 3

URL: http://habrahabr.ru/blogs/ror/91194/

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