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 Short circuiting in Lua 
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Petethegoat
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Joined: Mon Jun 15, 2009 4:02 pm
Posts: 905
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Post Short circuiting in Lua
Hey all.
I have a script as follows:
Code:
for actor in MovableMan.Actors do
   if self.box:WithinBox(actor.Pos) == true then
      self.Health= 0
   else
      self.Health = 100
   end
end

How would I have the script end (for that frame) if the check is found true?

Edit:
I'm not 100% sure that short circuiting is the correct term.
Please inform me if it isn't.
Tue Aug 17, 2010 11:13 pm
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TheLastBanana
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Joined: Wed Dec 13, 2006 5:27 am
Posts: 3138
Location: A little south and a lot west of Moscow
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Post Re: Short circuiting in Lua
You're looking for the term "break".
Code:
for actor in MovableMan.Actors do
   if self.box:WithinBox(actor.Pos) == true then
      self.Health= 0
      break;
   else
      self.Health = 100
   end
end
Tue Aug 17, 2010 11:52 pm
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Petethegoat
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Joined: Mon Jun 15, 2009 4:02 pm
Posts: 905
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Post Re: Short circuiting in Lua
I'm genuinely shocked that I didn't think of that, thanks!
Also, thanks for reminding me to semicolon properly.

Image

It now works when more than one actor exists, joyfully.
Wed Aug 18, 2010 12:15 am
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akblabla
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Joined: Wed May 20, 2009 3:10 pm
Posts: 366
Location: Århus, Denmark
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Post Re: Short circuiting in Lua
Don't know if it would work better or not, but i would just write the code like this

Code:
for actor in MovableMan.Actors do
   if self.box:WithinBox(actor.Pos) == true then
      self.Health= 0
   end
end


It is shorter and i think your previous code would make everyone's health stay at 100 when they are outside the area
Thu Aug 19, 2010 3:15 pm
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TheLastBanana
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Joined: Wed Dec 13, 2006 5:27 am
Posts: 3138
Location: A little south and a lot west of Moscow
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Post Re: Short circuiting in Lua
Actually, that is more efficient. However, to have the same effect as his code, don't forget to include this line first:
Code:
self.Health = 100;
Thu Aug 19, 2010 7:18 pm
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Petethegoat
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Joined: Mon Jun 15, 2009 4:02 pm
Posts: 905
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Post Re: Short circuiting in Lua
Code:
function Create(self)
   self.box = Box(Vector(self.Pos.X - 85, self.Pos.Y - 65), Vector(self.Pos.X + 85, self.Pos.Y + 70));
end

function Update(self)
   self.Scale = 1;
   for actor in MovableMan.Actors do
      if self.box:WithinBox(actor.Pos) == true then
         self.Scale = 0.001;
      end
   end
end

Works perfectly.

The self.Health was just because I wasn't sure if I'd want to publicly demonstrate the actual purpose I had in mind.
As it happens, I'm not really bothered. It's an interesting effect, but of questionable usefulness.
Thu Aug 19, 2010 7:29 pm
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