View difference between Paste ID: g7hhvWvg and rsMaWzk4

 local sensor = peripheral.wrap "left"
 local laser = peripheral.wrap "right"
 
 local function fire(entity)
 	local x, y, z = entity.x, entity.y, entity.z
 	local pitch = -math.atan2(y, math.sqrt(x * x + z * z))
 	local yaw = math.atan2(-x, z)
 
 	laser.fire(math.deg(yaw), math.deg(pitch), 5)
 	sleep(0.2)
 end
 
-local mobNames = { "Creeper", "Zombie", "Skeleton", "Blaze"}
+local mob_names = { "Creeper", "Zombie", "Skeleton", "Blaze"}
-local mobLookup = {}
+local mob_lookup = {}
-for i = 1, #mobNames do
+for _, mob in pairs(mob_names) do
-	mobLookup[mobNames[i]] = true
+	mob_lookup[mob] = true
 end
 
 local function distance(entity)
 	return math.sqrt(entity.x * entity.x + entity.y * entity.y + entity.z * entity.z)
-	local candidates = {}
+
-	for i = 1, #mobs do
+
-		local mob = mobs[i]
+
-		if mobLookup[mob.name] then
+
-			candidates[#candidates + 1] = mob
+	local nearest
 	for _, mob in pairs(mobs) do
 		if mob_lookup[mob.name] then
-	if #candidates > 0 then
+			mob.distance = distance(mob)
-		local mob = candidates[math.random(1, #candidates)]
+			if nearest == nil or mob.distance < nearest.distance then
-		fire(mob)
+				nearest = mob
 			end
 		end
 	end
 	if nearest then
 		fire(entity)
 	else
 		sleep(0.5)
 	end
 end