How do I detect if a game object exist?

this works :)

         if (GameObject.Find ("Character(Clone)") != null) {
             Debug.Log ("get one");
         } else {
             Debug.Log ("not there");
         }

thx

 using UnityEngine;
 
 public class MyMonobehaviour : MonoBehaviour
 {
     [SerializeField]
     private GameObject go;
 
     void Start()
     {
         if (go.scene.IsValid()) {
             // go is an instance of an object that's present in the scene
         } else {
             // go is an instance of a prefab
         }
     }
 }
 

Try this :

 var sceneName = testObject.scene.name;
 if (sceneName != null)
 {
     // this object is on scene
 }
 else
 {
     // this object is a prefab, not instantiate on any scene
 }

Im using this to check if the gameObject "pickleThing" is present like this:

if(GameObject.find("pickleThing") == null) { //insert code for showing text "mass extinction" here. }

Also give me the prefab version if this is incompatible with prefabs (also is this compatible with csharp?)