Editing WoW:Identifying buffs using textures (section)

===Other interesting uses===
You can find out whether the unit is affected by a debuff you can remove (by using the castable argument, which doubles up as removable for debuffs):
 name, rank, texture, count, debuffType, duration, timeLeft = iterateQueriableEffect(UnitDebuff, unit, ".", 1, true); -- "." matches all textures, so we only have to get a return from UnitDebuff(unit, id, true) for this to return something.
You can also use the id argument to find all buffs/debuffs with the same texture on target; for example, "Spell_Fire_FireArmor" is used for almost all fire-shield effects - Fire Ward, greater protection potions, warlock imps' fire thorns spell... suppose you wanted to iterate through them:
 local i, out = 1, "";
 while true do
  local name, rank = iterateQueriableEffect(UnitBuff, unit, "Spell_Fire_FireArmor", i);
  if not name then break; end
  out = out .. (out == "" and "" or ", ") .. name;
 end
 message("Following debuffs on unit share Spell_Fire_FireArmor texture: " .. out);
Note that the last example is somewhat inefficient - you would be better off acquiring all the buff names in a single local loop rather than iterating through buffs multiple times to find all occurrences of a certain texture.