Return nil Instead Of empty Array instance
Posted by root Fri, 08 Aug 2008 10:35:00 GMT
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
Multiplication Table In AoH Structure
Posted by root Sun, 03 Aug 2008 18:09:00 GMT
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