Lua Cheat Sheet

local age = 30local name = "Ada"local pi = 3.14159if age >= 18 then    print(name .. " is an adult")endfor i = 1, 5 do    print("Count: " .. i)end

-- tables are Lua's only data structure (array + map)local nums = {5, 3, 1, 4, 2}table.insert(nums, 6)          -- appendtable.remove(nums, 1)          -- remove index 1print(#nums)                   -- length operatorlocal person = {name = "Ada", age = 30}print(person.name)             -- dot syntaxperson["age"] = 31             -- bracket syntaxfor i, v in ipairs(nums) do print(i, v) end   -- sequentialfor k, v in pairs(person) do print(k, v) end  -- all keys

local Vector = {}Vector.__index = Vectorfunction Vector.new(x, y)    return setmetatable({x = x, y = y}, Vector)endVector.__add = function(a, b)    return Vector.new(a.x + b.x, a.y + b.y)endlocal v1 = Vector.new(1, 2)local v2 = Vector.new(3, 4)local v3 = v1 + v2       -- uses __add metamethod