Test for a game object's existence.

Questions & Answers
1

Is there a keyword I could use to test for an object’s existence? I want to make it so that only one bullet can be fired at a time.

2

GameObject implements the boolean operator which means you can just do:

if(GameObject.Find("ObjectName"))
{
    DoSomething();
}
3

You can use GameObject.Find or Object.FindObjectOfType, but these methods are quite expensive. And this way you will have to name each bulet with a different name or use a different class (type).

The best way is to keep a reference to your bullet once it is fired, and set this reference to null when the bullet is destroyed (or after a timeout). This way each gun can only fire one bullet at a time, but several guns can fire simultaneously:

public class Gun : MonoBehaviour
{
    public GameObject bullet;

    public void Fire()
    {
        if(this.bullet == null)
        {
            // code that shoot your bullet...
            this.bullet = mybullet; // assuming your instantiated bullet is mybullet
        }
    }

    public void BulletDestroyed()
    {
        this.bullet = null;
    }
}
4

Thank you everyone for the answers.

By firing one at a time, I meant when it disappears for any reason, you should be able to fire again (i.e., when it leaves the screen or hits an enemy.)

I’ll give these a try next time I work on it. For anyone wondering, this is my first game, it’s a simple project for my college Intro to Gaming class. Thanks again for the quick responses. :slight_smile: