dash left and right

okay, so I have compiled a script to make a character dash, both midair and on ground, but the character can only dash forward. I would like for the character to be able to dash both forward and backward.

Forward if I simply press the dash button (which I've assigned to the x key)

Backward if I press dash while holding down the left arrow key. This is part of what I came up with (only the pertinent stuff though)

var speed = 6;

var jumpSpeed = 8;

var jumpCount = 0;

var maxJump = 2;

var dashSpeed = 100.0;

var dashCount = 0;

var maxDash = 1;

private var moveDirection = Vector3.zero;

private var grounded : boolean = false;

function update () {

//allow free range horizontal movement while in air

if (!grounded) {

moveDirection.x = Input.GetAxis("Horizontal")*speed;

//air dash one time only

if (dashCount < maxDash) {

if (Input.GetKey (KeyCode.X)) {

moveDirection.x = dashSpeed;

dashCount++;} } }

else {moveDirection = Vector3(Input.GetAxis("Horizontal")*speed, 0.0, Input.GetAxis("Vertical")*speed);

//reset jump because we are grounded

 jumpCount = 0;

     //ground dash once

if (dashCount < maxDash) { if (Input.GetKeyDown (KeyCode.X)) { moveDirection.x = dashSpeed; dashCount++;}

   //reset dash upon key release

 else if (Input.GetKeyUp (KeyCode.X))

{dashCount = 0;}}

 //reset dash when used midair (otherwise you would need to press and release

 X again; if you simply reset dash when on ground you end up dashing forever

 until you fall off platform

 else {dashCount = 0;}

 }

okay so that's what I have, the character only wants to dash forward because dashSpeed is a positive integer, and the arrow keys don't reflect positive or negative values. I'm not sure what I need to do to tweak it, but if there is some sort of scripting knowledge I'm unaware of I would love to hear lol. Thank you!