How to change script's value for only one object?

Questions & Answers
1

I have a lot of objects and they all use one the same script.
I want to change script’s value for only one object. How can I do it?

Doesn’t work:

Component obj;

void Start ()
{
    obj = gameObject.GetComponent<WaypointAI>();
}

void OnTriggerEnter()
{
    obj.patrolSpeed = 5;
}

Work, but change value for all objects, which use script, not for one:

MyScriptName obj;

void Start ()
{
    obj = gameObject.GetComponent<ComponentWhichContainScript>();
}

void OnTriggerEnter()
{
    obj.patrolSpeed = 5;
}
2

give tag to that gameobject when it collide and check the gameobject which has tag and you script and change value of that gameobject script

3

I’m not sure of what you call script and object (GameObject and Component?)
But if you have the same component on several gameobject you can add a public field to your component and then change the value of your object from the Inspector.

public int speed = 5;
//...
void OnTriggerEnter()
{
    obj.patrolSpeed = speed;
}

Update :

Check if your special component exist/ is present and change the value if required.

bool isSpecial;

void Start ()
{
    obj = gameObject.GetComponent<ComponentWhichContainScript>
    isSpecial = (obj != null);
     //or something like this isSpecial = obj.IsSpecial();
       
}

void OnTriggerEnter()
{
    obj.patrolSpeed = (isSpecial)? 4 : 5;
}