Version: 2017.4
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Object.operator ==

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public static operator ==(x: Object, y: Object): bool;
public static bool operator ==(Object x, Object y);

Parameters

xThe first Object.
yThe Object to compare against the first.

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;

public class Example : 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;

public class Example : MonoBehaviour { public Transform target; void Update() { // Early out if the target is gone 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
using UnityEngine;

public class Example : MonoBehaviour { void Start() { 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.