CSHARP

unity destroy self

Destroy(gameObject);

unity destroy self

void Update() {
    float y = Random.Range(-4.53f, 2.207f);
    if(x < 2000) {
        GameObject clone = (GameObject)Instantiate(obstacle, new Vector3(y, x * 6.0f, 0),Quaternion.identity);
        clone.AddComponent(typeof(DestroyMySelf));
        x++;
    }
}