def equal(value, args, block)
        filter << value.to_i unless filter.index(value.to_i) 
      end
def equal(value, args, block)
        filter << value.to_i unless filter.index(value.to_i) 
      end
def equal ( value , args , block ) filter << value . to_i unless filter . index ( value . to_i ) end
Adds a single value to the filter
Adds a single value to the filter