Check if unit has alredy been afected

[NoobPromedio]

I have a unit "caster" that creates a proyectile "shockwavedummy", every 0.03 seconds it picks all the units in a 200 radius of the proyectile and deals 100 magic damage to them.
What i want is to check if a unit has alredy been dealt damage to, and if so, to not damage them again.

i've come up with this trigger, which remembers which units have been dealt damage, but the problem is that it does so anyway.

any advice on how to make it work?

 

[NoobPromedio]

And yes, i have no idea how to use hashtables

 

[Ceday]

Since your trigger is not MUI anyway, just use a single unit group variable instead of dealing with hashtables.

1- Clear your unit group at spell cast trigger.
2- At periodic trigger, if picked unit is not in that unit group, add picked unit to the group and deal damage.
3- (Not necessary, since you already do this at the start but I like being safe) Clear unit group at the end of the spell.