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

using UnityEngine;
using System.Collections;

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

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public target as Collider

    def OnTriggerEnter(trigger as Collider):
        if trigger == target:
            print('We hit the target trigger')

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

using UnityEngine;
using System.Collections;

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

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public target as Transform

    def Update():
        if target == null:
            return