Object.operator ==

Parameters

Description

Compares two object references to see if they refer to the same object.

    var target : Collider;
    function OnTriggerEnter (trigger : Collider) {
        if (trigger == target)
            print("We hit the target trigger");
    }

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public Collider target;
    void OnTriggerEnter(Collider trigger) {
        if (trigger == target)
            print("We hit the target trigger");
        
    }
}

Get early out if there is no target.

    var target : Transform;
    function Update () {
        // Early out if the target is gone
        if (target == null)
            return;
    }

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
    public Transform target;
    void Update() {
        if (target == null)
            return;
        
    }
}

Be careful when comparing with null.

e.g.

GameObject go = new GameObject();
Debug.Log (go == null); // false

Object obj = new Object();
Debug.Log (obj == null); // true

Instatiating a GameObject adds it to the scene so it's completely initialized (!destroyed). Instantiating a simple UnityEngine.Object has no such semantics, so the it stays in the 'destroyed' state which compares true to null.