Reach the Base

Lesson 3 of 18 in Coddy's Roblox Game: Tower Defense course.

An enemy that gets to the end of the path hurts the base. The base's health belongs on the server, but every player's screen will show it, so keep it as an attribute of the workspace: an attribute set on the server is seen by every client.

workspace:SetAttribute("BaseHealth", Settings.BaseHealth)
print(workspace:GetAttribute("BaseHealth")) --> 20

damageBase(amount) lowers it, never below 0 (math.max). After the last waypoint the enemy calls it and leaves the game with Destroy.

Challenge

Easy

After sorting the waypoints, set the workspace attribute BaseHealth to Settings.BaseHealth.
Write damageBase(amount), which lowers BaseHealth by amount, never below 0.
At the end of walkPath, after the last waypoint, call damageBase(1) and destroy the enemy.

Press Play, then Check.

Try it yourself

local Players = game:GetService("Players")
local ServerStorage = game:GetService("ServerStorage")
local Settings = require(game.ReplicatedStorage.Settings)

local enemies = workspace.Enemies

print("The base can take " .. Settings.BaseHealth .. " hits")

-- The waypoints, in order (they are named 1, 2, 3...)
local waypoints = workspace.Path.Waypoints:GetChildren()
table.sort(waypoints, function(a, b)
	return tonumber(a.Name) < tonumber(b.Name)
end)

-- Every player gets Money on the leaderboard
Players.PlayerAdded:Connect(function(player)
	local leaderstats = Instance.new("Folder")
	leaderstats.Name = "leaderstats"
	leaderstats.Parent = player

	local money = Instance.new("IntValue")
	money.Name = "Money"
	money.Value = Settings.StartMoney
	money.Parent = leaderstats
end)

-- Walk an enemy along the path. MoveTo gives up after 8 seconds and says so
-- (MoveToFinished with false), so a slow enemy is sent again until it arrives.
local function walkPath(enemy)
	local humanoid = enemy.Humanoid
	for i = 2, #waypoints do
		repeat
			humanoid:MoveTo(waypoints[i].Position)
		until humanoid.MoveToFinished:Wait() or not enemy.Parent
		if not enemy.Parent then
			return
		end
	end
end

-- A new enemy at the gate, walking the path
local function spawnEnemy(kind)
	local enemy = ServerStorage.Enemies[kind]:Clone()
	-- dropped in just above the first waypoint
	enemy:PivotTo(waypoints[1].CFrame + Vector3.new(0, 5, 0))
	enemy.Parent = enemies
	task.spawn(walkPath, enemy)
	return enemy
end

-- One enemy, for now
spawnEnemy("Zombie")