Advanced Dash System

local Character = script.Parent;
local Humanoid = Character:WaitForChild("Humanoid");
local HumanoidRootPart = Character:WaitForChild("HumanoidRootPart");

local SideGyro = Instance.new("BodyGyro")
SideGyro.MaxTorque = Vector3.new(3e5,0,3e5)
SideGyro.P = 5e5
SideGyro.Parent = HumanoidRootPart

local RunService = game:GetService('RunService')
local UserInputService = game:GetService('UserInputService')

local Dashing = false
local DashSpeed = 45
local DoubleTaps = {}

local Animations = {
	["DashRight"] = 'rbxassetid://12878249954';
	["DashLeft"] = 'rbxassetid://12878251537';
	["DashFront"] = 'rbxassetid://12878253087';
	["DashBack"] = 'rbxassetid://12878254845';
}

for i,v in pairs(Animations) do
	local Anim = Instance.new("Animation")
	Anim.AnimationId = v
	Anim = Humanoid:LoadAnimation(Anim)
	Animations[i] = Anim
end

function Dash(Key)
	if Dashing then
		return
	end

	local DashAnim = "Back"
	local Front = -1
	local Side = 0

	if Key == Enum.KeyCode.A then
		Side=-1
		Front = 0
		DashAnim = "Left"
	end

	if Key == Enum.KeyCode.D then
		Side=1
		Front = 0
		DashAnim = "Right"
	end

	if Key == Enum.KeyCode.W then
		Side=0
		Front = 1
		DashAnim = "Front"
	end

	if Key == Enum.KeyCode.S then
		Side=0
		Front = -1
		DashAnim = "Back"
	end

	Dashing = true
	Animations["Dash"..DashAnim]:Play()

	local DashVelocity = Instance.new("BodyVelocity")
	DashVelocity.MaxForce = Vector3.new(math.huge,0,math.huge)
	DashVelocity.P = 9e9
	DashVelocity.Parent = HumanoidRootPart
	DashVelocity.Velocity = HumanoidRootPart.CFrame.LookVector * (Front * DashSpeed) + HumanoidRootPart.CFrame.RightVector * (Side * DashSpeed)

	coroutine.wrap(function()
		task.wait(.1)
		local DashEffect = game.ReplicatedStorage.DustTrail:Clone();
		DashEffect.Parent = workspace;

		if DashAnim == "Left" then
			DashEffect.DustRight:Destroy();
			DashEffect.CFrame = Character["Right Leg"].CFrame * CFrame.new(-1,0,-2);
		else if DashAnim == "Right" then
				DashEffect.DustLeft:Destroy();
				DashEffect.CFrame = Character["Left Leg"].CFrame * CFrame.new(3,2,5);
			else if DashAnim == "Front" then
					DashEffect.DustLeft:Destroy();
					DashEffect.CFrame = Character.HumanoidRootPart.CFrame * CFrame.new(0,-1,3);
				else
					DashEffect.DustLeft:Destroy();
					DashEffect.CFrame = Character.HumanoidRootPart.CFrame * CFrame.new(0,-1,-.5);
				end
			end
		end

		for i,v in pairs(DashEffect:GetDescendants()) do
			if not v:IsA("ParticleEmitter") then continue end
			v:Emit(5);
		end

		game.Debris:AddItem(DashEffect, .5);
	end)()


	repeat wait() 	DashVelocity.Velocity = HumanoidRootPart.CFrame.LookVector * (Front * DashSpeed) + HumanoidRootPart.CFrame.RightVector * (Side * DashSpeed)
	until not Animations["Dash"..DashAnim].IsPlaying
	Dashing = false
	DashVelocity:Destroy()
end

function LoadDoubleTap(Key,Funct)
	DoubleTaps[Key] = tick()-10
	UserInputService.InputBegan:Connect(function(Pressed,Typing)

		if Pressed.KeyCode == Key then
			if (tick() - DoubleTaps[Key]) < .23 then
				Funct(Key)
			else
				DoubleTaps[Key] = tick()
			end
		end

	end)
end

LoadDoubleTap(Enum.KeyCode.W,Dash)
LoadDoubleTap(Enum.KeyCode.A,Dash)
LoadDoubleTap(Enum.KeyCode.S,Dash)
LoadDoubleTap(Enum.KeyCode.D,Dash)