Tell Unity that an Axis isn't being pressed when it is - javascript

Hello fellow programmers.
I'm here to ask you a very unusual question. I have created a game and in it when you hit a wall you bounce back but if you are still holding the key to go the direction you were going when you hit it it will just stay still, so I need to tell Unity that an Axis isn't being used anymore, is there a way to do this? Please note that I am using JavaScript and I am aware that it will be removed from Unity and that C# is better so don't comment that I should write code in C# please.
Code--
The movement:
if(Input.GetAxis("Forward") && isMovingBackward == false) {
if(lastDir == "backward") {
deaccelerate();
brake();
braking = true;
canRotLeft = false;
canRotRight = false;
} if(!(lastDir == "backward") && canMoveForw == true) {
accelerate();
isMoving = true;
isMovingForward = true;
isMovingBackward = false;
canRotLeft = true;
canRotRight = true;
lastDirForw();
transform.Translate(Vector3(1, 0, 0) * speed * Time.deltaTime);
}
}
if(!(Input.GetAxis("Forward"))) {
isMovingForward = false;
}
if(!(Input.GetAxis("Backward"))) {
isMovingBackward = false;
}
if(Input.GetAxis("Backward") && isMovingForward == false) {
if(lastDir == "forward") {
deaccelerate();
brake();
braking = true;
canRotLeft = false;
canRotRight = false;
} if(!(lastDir == "forward") && canMoveBack == true) {
accelerate();
isMoving = true;
isMovingBackward = true;
ifMovingForward = false;
breakingBack = false;
canRotLeft = true;
canRotRight = true;
lastDirBack();
transform.Translate(Vector3(1, 0, 0) * -speed * Time.deltaTime);
}
}
The lastDir functions:
function lastDirForw() {
if(collided == true) {
brake();
canMoveBack = false;
lastDir = "backward";
} else {
canMoveBack = true;
lastDir = "forward";
}
}
function lastDirBack() {
if(collided == true) {
brake();
canMoveForw = false;
lastDir = "forward";
} else {
canMoveForw = true;
lastDir = "backward";
}
}

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