how do I deal with a null?

I have a simple script for determining if you are using weapon A or weapon B, and it displays some info, I know there's going to be a "nil" result for atk  but I don't know how to address that fact and say "draw text nothing"

My script is as follows.

Code: [Select]

      if wpn_num >= 17
  self.contents.draw_text(484, 256, 96, 32, $data_weapons[wpn_num].atk.to_s)
    self.contents.font.color = system_color
  self.contents.draw_text(524, 224, 96, 32, "Rng")
    self.contents.font.color = normal_color
  self.contents.draw_text(576, 224, 64, 32, $ABS.RANGE_WEAPONS[wpn_num][4].to_s)
     else
if $data_weapons[wpn_num].atk != nil       
       self.contents.draw_text(469, 256, 96, 32, "+ " + $data_weapons[wpn_num].atk.to_s)
     else
       self.contents.draw_text(469, 256, 96, 32, "")
      end
       end


i'm not sure I parsed my "if" statement correctly either, actually.

You might want to try something like "unless weapon is nil?" to keep the code in the "unless" branch from running unless there's a valid weapon equipped.

It was my fault not realizing "no weapon" is actually registered as "0" and not nil. the thing that is nil is the base atk of the weapon 0. I think it's probably possible to even modify the stats of your "0" weapon, which could be turned into a series of martial arts - but you didn't hear that from me...

So here's my fixed code counting in "weapon 0".

Code: [Select]

if wpn_num >= 17
  self.contents.draw_text(484, 256, 96, 32, $data_weapons[wpn_num].atk.to_s)
    self.contents.font.color = system_color
  self.contents.draw_text(524, 224, 96, 32, "Rng")
    self.contents.font.color = normal_color
  self.contents.draw_text(576, 224, 64, 32, $ABS.RANGE_WEAPONS[wpn_num][4].to_s)
elsif wpn_num < 17 && wpn_num > 0 
  self.contents.draw_text(469, 256, 96, 32, "+ " + $data_weapons[wpn_num].atk.to_s)
else
  self.contents.draw_text(328, 256, 112, 32, "Unarmed: ")
  self.contents.draw_text(469, 256, 96, 32, "No Bonus")
end