Unity how you access other script

Let say you have 2 game object, Object A and Object B

Let say Object A have attached script A and Object B have attached script B

so how do you access script B function on your script A?

here is how you do it

ScriptA

var other : ScriptB;

function Update () {
    
    ScriptB.run();
}

ScriptB

function run() {
    Debug.Log("I RUN RUN RUN");
}

Note: MAKE SURE you drag OBJECT B into your OBJECT A script "Script A" variable "other"