[Lua] How to write normal trigger in LUA?

[The Nightmare Book]

do
  local trigger = CreateTrigger()
  TriggerRegisterAnyUnitEventBJ(trigger, EVENT_UNIT_DEATH)
  TriggerAddCondition(trigger, Condition(function()
  end))
  TriggerAddAction(trigger, function()
    print("Works")
  end)
end

I have map only with that code. Why my map crashes to main screen and not loading?
Latest version of Reforged.

 

[Nichilus]

as far as I know, conditions must return boolean value. Your condition function does not return anything

 

[The Nightmare Book]

as far as I know, conditions must return boolean value. Your condition function does not return anything

Thank you for clarifying, also I found error with TriggerRegisterAnyEventBJ, fixing that maked it working!

 

[Pyrogasm]

It's advised not to use a raw, unscoped do ... end in WC3 Lua because sometimes data declared there get garbage collected erroneously. Instead you should use something like this:

[Lua] - Total Initialization

Total Initialization Allows you to initialize your script in a safe, easy-to-debug environment. Allows your map's triggers to be arranged in any order* (similar to JassHelper). Enables functionality similar to Lua modules and vJass libraries. Provides helpful tools to hook into certain key...

www.hiveworkshop.com

 

[The Nightmare Book]

It's advised not to use a raw, unscoped do ... end in WC3 Lua because sometimes data declared there get garbage collected erroneously. Instead you should use something like this:

[Lua] - Total Initialization

Total Initialization Allows you to initialize your script in a safe, easy-to-debug environment. Allows your map's triggers to be arranged in any order* (similar to JassHelper). Enables functionality similar to Lua modules and vJass libraries. Provides helpful tools to hook into certain key...

www.hiveworkshop.com

Thanks for advice.
As I undestood correctly, more proper version of my custom script should be next:

do
 OnInit()
   local trigger = CreateTrigger()
   TriggerRegisterAnyUnitEventBJ(trigger, EVENT_UNIT_DEATH)
   TriggerAddCondition(trigger, Condition(function()
   end))
   TriggerAddAction(trigger, function()
     print("Works")
    end)
end

 

[Uncle]

I don't even bother using Conditions in Lua. Just throw an If Then Else in your Action and filter things there, although maybe that's slower?

do
 OnInit()

   local trigger = CreateTrigger()
   TriggerRegisterAnyUnitEventBJ(trigger, EVENT_UNIT_DEATH)

   TriggerAddAction(trigger, function()
       local u = GetTriggerUnit()
       if GetUnitLevel(u) <= 5 then
           print("it works")
       end
    end)

end

 

[The Nightmare Book]

I don't even bother using Conditions in Lua. Just throw an If Then Else in your Action and filter things there, although maybe that's slower?

do
 OnInit()
   local trigger = CreateTrigger()
   TriggerRegisterAnyUnitEventBJ(trigger, EVENT_UNIT_DEATH)

   TriggerAddAction(trigger, function()
       local u = GetTriggerUnit()
       if GetUnitLevel(u) <= 5 then
           print("it works")
       end
    end)
end

I agree with you, was trying to simulate standard GUI trigger in LUA, adding all fields (event, condition, action).
However I found where issue was - it was in event, which I used uncorrectly.
Event should be

 EVENT_PLAYER_UNIT_DEATH