How to make a Roblox currency system (with AI)

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4 files · 150 lines · 44 seconds · 1 credit

Sample output: ServerScriptService/CurrencyManager.lua

--!strict
-- ServerScriptService/CurrencyManager.lua  (Forge AI · excerpt)
local Players = game:GetService("Players")
local SaveService = require(script.Parent.CurrencySaveService)
local Logger = require(script.Parent.CurrencyLogger)

type Currencies = { cash: number, gems: number, premium: number }

local balances: { [Player]: Currencies } = {}
local leaderstatsMap: { [Player]: { [string]: NumberValue } } = {}

local function setupLeaderstats(player: Player, c: Currencies)
    local ls = Instance.new("Folder"); ls.Name = "leaderstats"; ls.Parent = player
    local map: { [string]: NumberValue } = {}
    for currencyName, value in pairs(c) do
        local nv = Instance.new("NumberValue")
        nv.Name = currencyName:gsub("^%l", string.upper)
        nv.Value = value; nv.Parent = ls
        map[currencyName] = nv
    end
    leaderstatsMap[player] = map
end

Players.PlayerAdded:Connect(function(player)
    local saved = SaveService:Get(player) or { cash = 100, gems = 0, premium = 0 }
    balances[player] = saved
    setupLeaderstats(player, saved)
end)

local CurrencyManager = {}

function CurrencyManager:add(player: Player, currency: string, amount: number, reason: string)
    local b = balances[player]
    if not b or amount <= 0 then return end
    b[currency] = (b[currency] or 0) + amount
    leaderstatsMap[player][currency].Value = b[currency]
    SaveService:Set(player, b)
    Logger:write(player, currency, amount, reason)
end

function CurrencyManager:spend(player: Player, currency: string, amount: number, reason: string): boolean
    local b = balances[player]
    if not b or amount <= 0 then return false end
    if (b[currency] or 0) < amount then return false end
    b[currency] -= amount
    leaderstatsMap[player][currency].Value = b[currency]
    SaveService:Set(player, b)
    Logger:write(player, currency, -amount, reason)
    return true
end

return CurrencyManager