← 🌙 Lua World

🌙 Damage Calculator

★★★☆☆ · worth 150 points

You can practise without a player, but pick a player to score points!

📖 The mission

Today you unlock

Functions return answers

A function is a tiny machine: it receives inputs, works something out, then returns one answer for the tests to check.

💡 Hint ladder

Subtract first, then check if it went below zero.
math.max(attack - defense, 0) does it in one line.

🧪 Coach checks

◯ normal hit 10 vs 3
◯ blocked completely
◯ exactly blocked
◯ no armour

Live coach

Getting ready

☆☆☆

💬 math.max picks the BIGGER of two numbers — handy to stop things going below zero.

print(math.max(7, 0))    -- 7
print(math.max(-4, 0))   -- 0  (never below zero!)

function spend(coins, price)
  return math.max(coins - price, 0)
end

print(spend(10, 3))   -- 7
print(spend(5, 9))    -- 0

📟 It printed:

📟 Output