Return nil Instead Of empty Array instance

Aug 08
2008
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class Array
  def empty_and_nil
    self.empty?? nil : self
  end
end
 
result = [1,2,3].empty_and_nil # [1, 2, 3]
result = [].empty_and_nil        # nil
Written by Vidul in: Ruby, array |

Multiplication Table In AoH Structure

Aug 03
2008
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mt = Array.new(10) { |e| Hash.new { |h,k| h[k] = k * e } }
 
mt[1][2] => 2
mt[2][2] => 4
mt[5][4] => 20
mt[9][5] => 45
Written by Vidul in: Ruby, array, hash |

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