How to instantiate a game object every time when space key is pressed

Questions & Answers
1

I want to instantiate a game object every time when the space key is pressed. Please help me with some solution below is my code-

public class arrow : MonoBehaviour {
public Rigidbody2D rb;
public float speed;
public GameObject arow;
// Use this for initialization
void Start () {

	}

// Update is called once per frame
void Update () {
	float x = Input.GetAxis ("Horizontal");
	if (x > 0) {
		MoveRight ();
	}
	if (Input.GetKeyDown (KeyCode.Space)) {
		Instantiate (arow);
	}

}
void MoveRight(){
	rb.velocity = new Vector2 (speed, 0);
}
void OnCollisionEnter2D(Collision2D col){
	if (col.gameObject.tag == "ball") {
		Destroy (gameObject);
	}
}
2

For that you will need some boolean and set it to true whenever you press the button and set it to false whenever you release it for example:

private bool SpacePressed=false;
    void Update
    {
         if (Input.GetKeyDown (KeyCode.Space)&& !SpacePressed)   
         {
            Instantiate (arow);
            SpacePressed=true;
         }
         else if (Input.GetKeyUp (KeyCode.Space))   
         {
             SpacePressed=false;
         }
    }
3

First of all thanks for your reply. Actually, I want the game object to be instantiated at starting position and it should move in a straight way. It will be a great help if you can help me with the code. Thanks.