How do I move player/object-2D up and down?

Questions & Answers
1

I am making a Ping Pong test game where two people can play (arrowDown + arrowUP and w + s) but i can’t get it to work. I made this by “translating” it from another script in UnityScript.

How can I get the player object to move up or down?

    [RequireComponent(typeof(Rigidbody2D))]
    [RequireComponent(typeof(BoxCollider2D))]
    
    public class PlayerControl : MonoBehaviour {
    
            //Var for which key to press to move
    	public KeyCode moveUp;
    	public KeyCode moveDown;
    
    	//The speed of the player
    	public int speed = 12;
    	
    	// Update is called once per frame
    	void Update () {
    		if (Input.GetKey(moveUp))
    		{
    			rigidbody2D.velocity = new Vector2(rigidbody2D.velocity.y, speed);
    		} 
    		else if (Input.GetKey(moveDown))
    		{
    			rigidbody2D.velocity = new Vector2(rigidbody2D.velocity.x, speed *-1);
    		} 
    		else 
    		{
    			rigidbody2D.velocity = new Vector2(rigidbody2D.velocity.y, 0);
    		}
    		rigidbody2D.velocity = new Vector2(rigidbody2D.velocity.x, 0);
    	}
    }
2

Line 28 is always being called so its overwriting any other velocity you set.

rigidbody2D.velocity = new Vector2(rigidbody2D.velocity.x, 0);

Since you only want it going up and down you only want to change the y value of the velocity.

// Update is called once per frame
void Update () {
   if (Input.GetKey(moveUp))
   {
	 rigidbody2D.velocity = new Vector2(0, speed);
   } 
   else if (Input.GetKey(moveDown))
   {
	 rigidbody2D.velocity = new Vector2(0, speed *-1);
   } 
   else 
   {
	 rigidbody2D.velocity = new Vector2(0, 0);
   }
}