Reliable Customisable Double Jump System

[viperology111]

I found there are no double jump scripts that were very reliable lying around on the internet so I created this - a system that always allows you to jump no matter how laggy your device:

local JUMP_MULTI = 2        -- How many times your jump height is multiplied
local MAX_EXTRA_JUMPS = 1	-- 0 = Single jump; 1 = Double jump; etc

local RunService = game:GetService("RunService")

local Player = game.Players.LocalPlayer
local Character = Player.Character
if Character == nil then Player.CharacterAdded:Wait() end
local Humanoid = Character:WaitForChild("Humanoid")

local Material = Enum.Material
local StateType = Enum.HumanoidStateType

local boostCount = 0
local lastJump = false

RunService.RenderStepped:Connect(function()
	if Humanoid.FloorMaterial == Material.Air or boostCount == 0 then return end

	boostCount = 0
	Humanoid.JumpHeight /= JUMP_MULTI
end)

local function Boost()
	if boostCount >= MAX_EXTRA_JUMPS then return end
	
	if boostCount == 0 then Humanoid.JumpHeight *= JUMP_MULTI end
	boostCount += 1
	
	Humanoid:ChangeState(StateType.Jumping)
end

RunService.RenderStepped:Connect(function()
	if Humanoid.Jump == true and Humanoid.FloorMaterial == Material.Air and lastJump == false then Boost() end
	lastJump = Humanoid.Jump
end)

Feel free to use it anywhere