ROBLOX Color3FromHex

local c3 = Color3.new
local floor = math.floor
local function Color3FromHex(str)
    if type(str) == "number" then -- in case of hexadecimal numbers, we can do this!
        return c3(floor(str / (256^2)), floor(str / 256) % 256, str % 256)
    end
    assert(type(str) == "string" and str:gsub("^#", ""):match("^%x+$"), "Input must be a hexadecimal string or number")
    str = str:gsub("^#", ""):upper()
    if #str == 3 then
        str = str:sub(1, 1):rep(2) .. str:sub(2, 2):rep(2) .. str:sub(3, 3):rep(2)
    elseif #str == 1 then
        str = str:rep(6)
    end
    if #str == 6 then
        return c3(tonumber(str:sub(1, 2), 16) / 255, tonumber(str:sub(2, 3), 16) / 255, tonumber(str:sub(4, 5), 16) / 255)
    else
        return c3()
    end
end

local function Color3FromHex2(str)
    if type(str) == "number" then -- in case of hexadecimal numbers, we can do this!
        return c3(floor(str / (256^2)), floor(str / 256) % 256, str % 256)
    end str = tonumber(str,16)
    assert(str, "Input must be a hexadecimal string or number")
    return Color3FromHex(str)
end

local n = 100000
local start = tick()
for i = 1, n do
    local c = Color3FromHex("#ffffff")
end
print("#ffffff:", ((tick() - start) / n) * 1000, "ms")
wait(0.1)
local start = tick()
for i = 1, n do
    local c = Color3FromHex("000000")
end
print("000000:", ((tick() - start) / n) * 1000, "ms")
wait(0.1)
local start = tick()
for i = 1, n do
    local c = Color3FromHex("#f00")
end
print("#f00:", ((tick() - start) / n) * 1000, "ms")
wait(0.1)
local start = tick()
for i = 1, n do
    local c = Color3FromHex("0a0")
end
print("0a0:", ((tick() - start) / n) * 1000, "ms")
wait(0.1)
local start = tick()
for i = 1, n do
    local c = Color3FromHex("#F")
end
print("#F:", ((tick() - start) / n) * 1000, "ms")
wait(0.1)

local start = tick()
for i = 1, n do
    local c = Color3FromHex2("ffffff")
end
print("hex2 ffffff:", ((tick() - start) / n) * 1000, "ms")
wait(0.1)

local start = tick()
for i = 1, n do
    local c = Color3FromHex2("f00")
end
print("hex2 f00 (broken):", ((tick() - start) / n) * 1000, "ms")
wait(0.1)

local start = tick()
for i = 1, n do
    local c = Color3FromHex(0xffffff)
end
print("0xffffff:", ((tick() - start) / n) * 1000, "ms")
wait(0.1)


print(Color3FromHex("#ffffff"))
print(Color3FromHex("000000"))
print(Color3FromHex("#f00"))
print(Color3FromHex("0a0"))
print(Color3FromHex("#F"))
print(Color3FromHex(0xffffff))
print(Color3FromHex(0xffffffff))
print(Color3FromHex2("f00"))

--[[print(0xffffff)
print(tostring(0xffffff))
print(0xffffff % 256, math.floor(0xffffff / 256) % 256, math.floor(0xffffff / (256^2)) % 256)]]